document support for inline HTML

doc/markdown/markdown.md

@@ -421,7 +421,7 @@ Quote break.
 
 You can also use raw HTML in your Markdown, and it'll mostly work pretty well.
 
-Note that inline HTML is disabled in the default Gitlab configuration, although it is [possible](https://github.com/gitlabhq/gitlabhq/pull/8007/commits) for the system administrator to enable it.
+See the documentation for HTML::Pipeline's [SanitizationFilter](http://www.rubydoc.info/gems/html-pipeline/HTML/Pipeline/SanitizationFilter#WHITELIST-constant) class for the list of allowed HTML tags and attributes.  In addition to the default `SanitizationFilter` whitelist, GitLab allows the `class`, `id`, and `style` attributes.
 
 ```no-highlight
 <dl>
@@ -441,8 +441,6 @@ Note that inline HTML is disabled in the default Gitlab configuration, although
   <dd>Does *not* work **very** well. Use HTML <em>tags</em>.</dd>
 </dl>
 
-See the documentation for HTML::Pipeline's [SanitizationFilter](http://www.rubydoc.info/gems/html-pipeline/HTML/Pipeline/SanitizationFilter#WHITELIST-constant) class for the list of allowed HTML tags and attributes.  In addition to the default `SanitizationFilter` whitelist, GitLab allows the `class`, `id`, and `style` attributes.
-
 ## Horizontal Rule
 
 ```