fix typo

docs/base-css.html

@@ -1316,7 +1316,7 @@ For example, <code>section</code> should be wrapped as inline.
       <tr>
         <td><button class="btn btn-info" href="#">Info</button></td>
         <td><code>btn btn-info</code></td>
-        <td>Used as an alternate to the default styles</td>
+        <td>Used as an alternative to the default styles</td>
       </tr>
       <tr>
         <td><button class="btn btn-success" href="#">Success</button></td>

docs/templates/pages/base-css.mustache

@@ -1239,7 +1239,7 @@
       <tr>
         <td><button class="btn btn-info" href="#">{{_i}}Info{{/i}}</button></td>
         <td><code>btn btn-info</code></td>
-        <td>{{_i}}Used as an alternate to the default styles{{/i}}</td>
+        <td>{{_i}}Used as an alternative to the default styles{{/i}}</td>
       </tr>
       <tr>
         <td><button class="btn btn-success" href="#">{{_i}}Success{{/i}}</button></td>