fix form display issue in docs

docs/base-css.html

@@ -963,7 +963,7 @@ For example, <code>section</code> should be wrapped as inline.
 
   <h4>Default options</h4>
   <p>Wrap a <code>.add-on</code> and an <code>input</code> with one of two classes to prepend or append text to an input.</p>
-  <form class="bs-docs-example form-inline">
+  <form class="bs-docs-example">
     <div class="input-prepend">
       <span class="add-on">@</span><input class="span2" id="prependedInput" size="16" type="text" placeholder="Username">
     </div>

docs/templates/pages/base-css.mustache

@@ -894,7 +894,7 @@
 
   <h4>{{_i}}Default options{{/i}}</h4>
   <p>{{_i}}Wrap a <code>.add-on</code> and an <code>input</code> with one of two classes to prepend or append text to an input.{{/i}}</p>
-  <form class="bs-docs-example form-inline">
+  <form class="bs-docs-example">
     <div class="input-prepend">
       <span class="add-on">@</span><input class="span2" id="prependedInput" size="16" type="text" placeholder="{{_i}}Username{{/i}}">
     </div>