Remove "Remove margin on the body" from base css docs

Normalize did that.

css.html

@@ -44,7 +44,6 @@ base_url: "../"
     <h3 id="overview-type-links">Typography and links</h3>
     <p>Bootstrap sets basic global display, typography, and link styles. Specifically, we:</p>
     <ul>
-      <li>Remove <code>margin</code> on the body</li>
       <li>Set <code>background-color: #fff;</code> on the <code>body</code></li>
       <li>Use the <code>@font-family-base</code>, <code>@font-size-base</code>, and <code>@line-height-base</code> attributes as our typographic base</li>
       <li>Set the global link color via <code>@link-color</code> and apply link underlines only on <code>:hover</code></li>