Fix validation errors.

Surprisingly those weren't reported by the validator; only in the grunt-contrib-htmlmin branch they were reported, so after digging into it, I saw they were indeed errors...

docs/_includes/js/collapse.html

@@ -221,7 +221,7 @@ $('.collapse').collapse()
   <h3 id="collapse-methods">Methods</h3>
 
   <h4>.collapse(options)</h4>
-  <p>Activates your content as a collapsible element. Accepts an optional options <code>object</code>.
+  <p>Activates your content as a collapsible element. Accepts an optional options <code>object</code>.</p>
 {% highlight js %}
 $('#myCollapsible').collapse({
   toggle: false

docs/_includes/js/overview.html

@@ -48,7 +48,7 @@ $('#myModal').modal('show')                // initializes and invokes show immed
   <p>Each plugin also exposes its raw constructor on a <code>Constructor</code> property: <code>$.fn.popover.Constructor</code>. If you'd like to get a particular plugin instance, retrieve it directly from an element: <code>$('[rel="popover"]').data('popover')</code>.</p>
 
   <h4>Default settings</h4>
-  <p>You can change the default settings for a plugin by modifying the plugin's <code>Constructor.DEFAULTS</code> object:<p>
+  <p>You can change the default settings for a plugin by modifying the plugin's <code>Constructor.DEFAULTS</code> object:</p>
 {% highlight js %}
 $.fn.modal.Constructor.DEFAULTS.keyboard = false // changes default for the modal plugin's `keyboard` option to false
 {% endhighlight %}