add missing role="menu" attrs to .dropdown-menu elements in docs+examples

Docs audit prompted by #13697.
[skip sauce]

docs/_includes/components/button-dropdowns.html

@@ -246,7 +246,7 @@
   <button class="btn btn-default btn-lg dropdown-toggle" type="button" data-toggle="dropdown">
     Large button <span class="caret"></span>
   </button>
-  <ul class="dropdown-menu">
+  <ul class="dropdown-menu" role="menu">
     ...
   </ul>
 </div>
@@ -256,7 +256,7 @@
   <button class="btn btn-default btn-sm dropdown-toggle" type="button" data-toggle="dropdown">
     Small button <span class="caret"></span>
   </button>
-  <ul class="dropdown-menu">
+  <ul class="dropdown-menu" role="menu">
     ...
   </ul>
 </div>
@@ -266,7 +266,7 @@
   <button class="btn btn-default btn-xs dropdown-toggle" type="button" data-toggle="dropdown">
     Extra small button <span class="caret"></span>
   </button>
-  <ul class="dropdown-menu">
+  <ul class="dropdown-menu" role="menu">
     ...
   </ul>
 </div>
@@ -313,7 +313,7 @@
     <span class="caret"></span>
     <span class="sr-only">Toggle Dropdown</span>
   </button>
-  <ul class="dropdown-menu">
+  <ul class="dropdown-menu" role="menu">
     <!-- Dropdown menu links -->
   </ul>
 </div>

docs/_includes/components/button-groups.html

@@ -121,7 +121,7 @@
       Dropdown
       <span class="caret"></span>
     </button>
-    <ul class="dropdown-menu">
+    <ul class="dropdown-menu" role="menu">
       <li><a href="#">Dropdown link</a></li>
       <li><a href="#">Dropdown link</a></li>
     </ul>

docs/_includes/components/navbar.html

@@ -98,7 +98,7 @@
         <li><a href="#">Link</a></li>
         <li class="dropdown">
           <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <span class="caret"></span></a>
-          <ul class="dropdown-menu">
+          <ul class="dropdown-menu" role="menu">
             <li><a href="#">Action</a></li>
             <li><a href="#">Another action</a></li>
             <li><a href="#">Something else here</a></li>
@@ -119,7 +119,7 @@
         <li><a href="#">Link</a></li>
         <li class="dropdown">
           <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <span class="caret"></span></a>
-          <ul class="dropdown-menu">
+          <ul class="dropdown-menu" role="menu">
             <li><a href="#">Action</a></li>
             <li><a href="#">Another action</a></li>
             <li><a href="#">Something else here</a></li>

docs/_includes/components/navs.html

@@ -137,7 +137,7 @@
     <a class="dropdown-toggle" data-toggle="dropdown" href="#">
       Dropdown <span class="caret"></span>
     </a>
-    <ul class="dropdown-menu">
+    <ul class="dropdown-menu" role="menu">
       ...
     </ul>
   </li>
@@ -171,7 +171,7 @@
     <a class="dropdown-toggle" data-toggle="dropdown" href="#">
       Dropdown <span class="caret"></span>
     </a>
-    <ul class="dropdown-menu">
+    <ul class="dropdown-menu" role="menu">
       ...
     </ul>
   </li>

docs/examples/carousel/index.html

@@ -53,7 +53,7 @@
                 <li><a href="#contact">Contact</a></li>
                 <li class="dropdown">
                   <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <span class="caret"></span></a>
-                  <ul class="dropdown-menu">
+                  <ul class="dropdown-menu" role="menu">
                     <li><a href="#">Action</a></li>
                     <li><a href="#">Another action</a></li>
                     <li><a href="#">Something else here</a></li>

docs/examples/navbar-fixed-top/index.html

@@ -51,7 +51,7 @@
             <li><a href="#contact">Contact</a></li>
             <li class="dropdown">
               <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <span class="caret"></span></a>
-              <ul class="dropdown-menu">
+              <ul class="dropdown-menu" role="menu">
                 <li><a href="#">Action</a></li>
                 <li><a href="#">Another action</a></li>
                 <li><a href="#">Something else here</a></li>

docs/examples/navbar-static-top/index.html

@@ -51,7 +51,7 @@
             <li><a href="#contact">Contact</a></li>
             <li class="dropdown">
               <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <span class="caret"></span></a>
-              <ul class="dropdown-menu">
+              <ul class="dropdown-menu" role="menu">
                 <li><a href="#">Action</a></li>
                 <li><a href="#">Another action</a></li>
                 <li><a href="#">Something else here</a></li>

docs/examples/navbar/index.html

@@ -53,7 +53,7 @@
               <li><a href="#">Link</a></li>
               <li class="dropdown">
                 <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <span class="caret"></span></a>
-                <ul class="dropdown-menu">
+                <ul class="dropdown-menu" role="menu">
                   <li><a href="#">Action</a></li>
                   <li><a href="#">Another action</a></li>
                   <li><a href="#">Something else here</a></li>

docs/examples/non-responsive/index.html

@@ -53,7 +53,7 @@
             <li><a href="#contact">Contact</a></li>
             <li class="dropdown">
               <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <span class="caret"></span></a>
-              <ul class="dropdown-menu">
+              <ul class="dropdown-menu" role="menu">
                 <li><a href="#">Action</a></li>
                 <li><a href="#">Another action</a></li>
                 <li><a href="#">Something else here</a></li>

docs/examples/sticky-footer-navbar/index.html

@@ -51,7 +51,7 @@
             <li><a href="#contact">Contact</a></li>
             <li class="dropdown">
               <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <span class="caret"></span></a>
-              <ul class="dropdown-menu">
+              <ul class="dropdown-menu" role="menu">
                 <li><a href="#">Action</a></li>
                 <li><a href="#">Another action</a></li>
                 <li><a href="#">Something else here</a></li>

docs/examples/theme/index.html

@@ -53,7 +53,7 @@
             <li><a href="#contact">Contact</a></li>
             <li class="dropdown">
               <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <span class="caret"></span></a>
-              <ul class="dropdown-menu">
+              <ul class="dropdown-menu" role="menu">
                 <li><a href="#">Action</a></li>
                 <li><a href="#">Another action</a></li>
                 <li><a href="#">Something else here</a></li>
@@ -399,7 +399,7 @@
               <li><a href="#contact">Contact</a></li>
               <li class="dropdown">
                 <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <span class="caret"></span></a>
-                <ul class="dropdown-menu">
+                <ul class="dropdown-menu" role="menu">
                   <li><a href="#">Action</a></li>
                   <li><a href="#">Another action</a></li>
                   <li><a href="#">Something else here</a></li>
@@ -432,7 +432,7 @@
               <li><a href="#contact">Contact</a></li>
               <li class="dropdown">
                 <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <span class="caret"></span></a>
-                <ul class="dropdown-menu">
+                <ul class="dropdown-menu" role="menu">
                   <li><a href="#">Action</a></li>
                   <li><a href="#">Another action</a></li>
                   <li><a href="#">Something else here</a></li>