edit comment on IE7-8 support of :focus in navbar-search

less/navbar.less

@@ -133,7 +133,7 @@
       background-color: @grayLight;
       background-color: rgba(255,255,255,.5);
     }
-    // Focus states (we use .focused since IE8 and down doesn't support :focus)
+    // Focus states (we use .focused since IE7-8 and down doesn't support :focus)
     &:focus,
     &.focused {
       padding: 5px 10px;