remove warning from icons section about :after labels, add section to explain spacing

docs/base-css.html

@@ -1516,9 +1516,6 @@ For example, <code>section</code> should be wrapped as inline.
       </ul>
     </div>
   </div>
-  <div class="alert alert-info">
-    <strong>Heads up!</strong> Icon classes are echoed via CSS <code>:after</code>. In the docs, we show a light red background color on hover to highlight the icon's size.
-  </div>
 
   <br>
 
@@ -1531,7 +1528,7 @@ For example, &lt;code&gt;section&lt;/code&gt; should be wrapped as inline.
     </div>
     <div class="span4">
       <h3>How to use</h3>
-      <p>With v2.0.1, we have opted to use an <code>&lt;i&gt;</code> tag for all our icons, but they have no case class&mdash;only a shared prefix. To use, place the following code just about anywhere:</p>
+      <p>Bootstrap uses an <code>&lt;i&gt;</code> tag for all icons, but they have no case class&mdash;only a shared prefix. To use, place the following code just about anywhere:</p>
 <pre class="prettyprint linenums">
 &lt;i class="icon-search"&gt;&lt;/i&gt;
 </pre>
@@ -1540,6 +1537,7 @@ For example, &lt;code&gt;section&lt;/code&gt; should be wrapped as inline.
 &lt;i class="icon-search icon-white"&gt;&lt;/i&gt;
 </pre>
       <p>There are 120 classes to choose from for your icons. Just add an <code>&lt;i&gt;</code> tag with the right classes and you're set. You can find the full list in <strong>sprites.less</strong> or right here in this document.</p>
+      <p>When using beside strings of text, as in buttons or nav links, be sure to leave a space after the <code>&lt;i&gt;</code> tag for proper spacing.</p>
     </div>
     <div class="span4">
       <h3>Use cases</h3>

docs/templates/pages/base-css.mustache

@@ -1440,9 +1440,6 @@
       </ul>
     </div>
   </div>
-  <div class="alert alert-info">
-    {{_i}}<strong>Heads up!</strong> Icon classes are echoed via CSS <code>:after</code>. In the docs, we show a light red background color on hover to highlight the icon's size.{{/i}}
-  </div>
 
   <br>
 
@@ -1455,7 +1452,7 @@
     </div>
     <div class="span4">
       <h3>{{_i}}How to use{{/i}}</h3>
-      <p>{{_i}}With v2.0.1, we have opted to use an <code>&lt;i&gt;</code> tag for all our icons, but they have no case class&mdash;only a shared prefix. To use, place the following code just about anywhere:{{/i}}</p>
+      <p>{{_i}}Bootstrap uses an <code>&lt;i&gt;</code> tag for all icons, but they have no case class&mdash;only a shared prefix. To use, place the following code just about anywhere:{{/i}}</p>
 <pre class="prettyprint linenums">
 &lt;i class="icon-search"&gt;&lt;/i&gt;
 </pre>
@@ -1464,6 +1461,7 @@
 &lt;i class="icon-search icon-white"&gt;&lt;/i&gt;
 </pre>
       <p>{{_i}}There are 120 classes to choose from for your icons. Just add an <code>&lt;i&gt;</code> tag with the right classes and you're set. You can find the full list in <strong>sprites.less</strong> or right here in this document.{{/i}}</p>
+      <p>{{_i}}When using beside strings of text, as in buttons or nav links, be sure to leave a space after the <code>&lt;i&gt;</code> tag for proper spacing.{{/i}}</p>
     </div>
     <div class="span4">
       <h3>{{_i}}Use cases{{/i}}</h3>