drop span2-4 on form examples to 1-3

docs/base-css.html

@@ -1066,9 +1066,9 @@ For example, <code>section</code> should be wrapped as inline.
           <div class="control-group">
             <label class="control-label">Form sizes</label>
             <div class="controls docs-input-sizes">
+              <input class="span1" type="text" placeholder=".span1">
               <input class="span2" type="text" placeholder=".span2">
               <input class="span3" type="text" placeholder=".span3">
-              <input class="span4" type="text" placeholder=".span4">
               <p class="help-block">Use the same <code>.span*</code> classes from the grid system for input sizes.</p>
             </div>
           </div>

docs/templates/pages/base-css.mustache

@@ -1001,9 +1001,9 @@
           <div class="control-group">
             <label class="control-label">{{_i}}Form sizes{{/i}}</label>
             <div class="controls docs-input-sizes">
+              <input class="span1" type="text" placeholder=".span1">
               <input class="span2" type="text" placeholder=".span2">
               <input class="span3" type="text" placeholder=".span3">
-              <input class="span4" type="text" placeholder=".span4">
               <p class="help-block">{{_i}}Use the same <code>.span*</code> classes from the grid system for input sizes.{{/i}}</p>
             </div>
           </div>