clean up emphasis docs text

docs/base-css.html

@@ -155,14 +155,14 @@
 </pre>
 
           <h3>Bold</h3>
-          <p>For emphasizing a snippet of text with <strong>important</strong></p>
+          <p>For emphasizing a snippet of text with a heavier font-weight.</p>
           <div class="bs-docs-example">
             <p>The following snippet of text is <strong>rendered as bold text</strong>.</p>
           </div>
           <pre class="prettyprint">&lt;strong&gt;rendered as bold text&lt;/strong&gt;</pre>
 
           <h3>Italics</h3>
-          <p>For emphasizing a snippet of text with <em>stress</em></p>
+          <p>For emphasizing a snippet of text with italics.</p>
           <div class="bs-docs-example">
             <p>The following snippet of text is <em>rendered as italicized text</em>.</p>
           </div>

docs/templates/pages/base-css.mustache

@@ -89,14 +89,14 @@
 </pre>
 
           <h3>{{_i}}Bold{{/i}}</h3>
-          <p>{{_i}}For emphasizing a snippet of text with <strong>important</strong>{{/i}}</p>
+          <p>{{_i}}For emphasizing a snippet of text with a heavier font-weight.{{/i}}</p>
           <div class="bs-docs-example">
             <p>The following snippet of text is <strong>rendered as bold text</strong>.</p>
           </div>
           <pre class="prettyprint">&lt;strong&gt;rendered as bold text&lt;/strong&gt;</pre>
 
           <h3>{{_i}}Italics{{/i}}</h3>
-          <p>{{_i}}For emphasizing a snippet of text with <em>stress</em>{{/i}}</p>
+          <p>{{_i}}For emphasizing a snippet of text with italics.{{/i}}</p>
           <div class="bs-docs-example">
             <p>The following snippet of text is <em>rendered as italicized text</em>.</p>
           </div>