Merge pull request #6462 from cvrebert/input-required-docs-fix-2.3.0

update 2.3.0 docs to reflect #5786

docs/base-css.html

@@ -1572,7 +1572,7 @@ For example, <code><section></code> should be wrapped
 </pre>
 
           <h3>Invalid inputs</h3>
-          <p>Style inputs via default browser functionality with <code>:invalid</code>. Specify a <code>type</code> and add the <code>required</code> attribute.</p>
+          <p>Style inputs via default browser functionality with <code>:invalid</code>. Specify a <code>type</code>, add the <code>required</code> attribute if the field is not optional, and (if applicable) specify a <code>pattern</code>.</p>
           <form class="bs-docs-example form-inline">
             <input class="span3" type="email" placeholder="test@example.com" required>
           </form>

docs/templates/pages/base-css.mustache

@@ -1509,7 +1509,7 @@
 </pre>
 
           <h3>{{_i}}Invalid inputs{{/i}}</h3>
-          <p>{{_i}}Style inputs via default browser functionality with <code>:invalid</code>. Specify a <code>type</code> and add the <code>required</code> attribute.{{/i}}</p>
+          <p>{{_i}}Style inputs via default browser functionality with <code>:invalid</code>. Specify a <code>type</code>, add the <code>required</code> attribute if the field is not optional, and (if applicable) specify a <code>pattern</code>.{{/i}}</p>
           <form class="bs-docs-example form-inline">
             <input class="span3" type="email" placeholder="test@example.com" required>
           </form>