Clean up old `muted` references and switch to `text-muted`.

docs/_includes/footer.html

@@ -7,7 +7,7 @@
     <p>Designed and built with all the love in the world by <a href="https://twitter.com/mdo" target="_blank">@mdo</a> and <a href="https://twitter.com/fat" target="_blank">@fat</a>.</p>
     <p>Maintained by the <a href="https://github.com/orgs/twbs/people">core team</a> with the help of <a href="https://github.com/twbs/bootstrap/graphs/contributors">our contributors</a>.</p>
     <p>Code licensed under <a href="https://github.com/twbs/bootstrap/blob/master/LICENSE" target="_blank">MIT</a>, documentation under <a href="http://creativecommons.org/licenses/by/3.0/">CC BY 3.0</a>.</p>
-    <ul class="bs-docs-footer-links muted">
+    <ul class="bs-docs-footer-links text-muted">
       <li>Currently v{{ site.current_version }}</li>
       <li>&middot;</li>
       <li><a href="{{ site.repo }}">GitHub</a></li>

docs/_includes/js/tooltips.html

@@ -6,8 +6,7 @@
   <h2 id="tooltips-examples">Examples</h2>
   <p>Hover over the links below to see tooltips:</p>
   <div class="bs-example tooltip-demo">
-    <p class="muted" style="margin-bottom: 0;">Tight pants next level keffiyeh <a href="#" data-toggle="tooltip" title="Default tooltip">you probably</a> haven't heard of them. Photo booth beard raw denim letterpress vegan messenger bag stumptown. Farm-to-table seitan, mcsweeney's fixie sustainable quinoa 8-bit american apparel <a href="#" data-toggle="tooltip" title="Another tooltip">have a</a> terry richardson vinyl chambray. Beard stumptown, cardigans banh mi lomo thundercats. Tofu biodiesel williamsburg marfa, four loko mcsweeney's cleanse vegan chambray. A really ironic artisan <a href="#" data-toggle="tooltip" title="Another one here too">whatever keytar</a>, scenester farm-to-table banksy Austin <a href="#" data-toggle="tooltip" title="The last tip!">twitter handle</a> freegan cred raw denim single-origin coffee viral.
-    </p>
+    <p>Tight pants next level keffiyeh <a href="#" data-toggle="tooltip" title="Default tooltip">you probably</a> haven't heard of them. Photo booth beard raw denim letterpress vegan messenger bag stumptown. Farm-to-table seitan, mcsweeney's fixie sustainable quinoa 8-bit american apparel <a href="#" data-toggle="tooltip" title="Another tooltip">have a</a> terry richardson vinyl chambray. Beard stumptown, cardigans banh mi lomo thundercats. Tofu biodiesel williamsburg marfa, four loko mcsweeney's cleanse vegan chambray. A really ironic artisan <a href="#" data-toggle="tooltip" title="Another one here too">whatever keytar</a>, scenester farm-to-table banksy Austin <a href="#" data-toggle="tooltip" title="The last tip!">twitter handle</a> freegan cred raw denim single-origin coffee viral.</p>
   </div><!-- /example -->
 
   <h3>Static tooltip</h3>

docs/assets/css/src/docs.css

@@ -144,7 +144,6 @@ body {
 .bs-docs-footer-links {
   padding-left: 0;
   margin-top: 20px;
-  color: #999;
 }
 .bs-docs-footer-links li {
   display: inline;