Rename section "Other data sources" to "Data sources".

Also adds an introductional paragraph to the section.

docs/_includes/examples/data.html

@@ -1,9 +1,11 @@
 <section>
 
-  <h1 id="data-other" class="page-header">
-    Other data sources
+  <h1 id="data" class="page-header">
+    Data sources
   </h1>
 
+  <p>In addition to handling options from a standard <code>&lt;select&gt;</code>, Select2 can also retrieve the results from other data sources.</p>
+
   <h2 id="data-array" >Loading array data</h2>
 
   <p>

docs/_includes/nav/examples.html

@@ -15,8 +15,8 @@
       <a href="#placeholders">Placeholders</a>
     </li>
     <li>
-      <a href="#data-other">
-        Other data sources
+      <a href="#data">
+        Data sources
       </a>
       <ul class="nav">
         <li>