fixed main element definition

sections/semantics.include

@@ -5495,8 +5495,7 @@
     </dd>
   </dl>
 
-  The <{main}> element can be used as a container for the dominant contents of another
-  element. It <a>represents</a> its children.
+  The <{main}> element <a>represents</a> the main content of the body of a document or application.
 
   <p class="note">
     The <{main}> element is not <a>sectioning content</a> and has no effect on the document
@@ -5507,13 +5506,6 @@
   information, site logos and banners and search forms (unless the document or applications main
   function is that of a search form).
 
-  <p class="note">
-    There is no restriction as to the number of <{main}> elements in a document. Indeed,
-    there are many cases where it would make sense to have multiple <{main}> elements. For
-    example, a page with multiple <{article}> elements might need to indicate the dominant
-    contents of each such element.
-  </p>
-
   Authors must not include the <{main}> element as a descendant of an <{article}>,
   <{aside}>, <{footer}>, <code>header</code> or <{nav}> element.
 
@@ -5524,19 +5516,6 @@
     [[#grouping-content]] or <a>sectioning content</a> element as appropriate.
   </p>
 
-  <p class="note">
-    Authors are advised to use ARIA <code>role="main"</code> attribute on the <code>main</code>
-    element until user agents implement the required role mapping.
-  </p>
-
-  <div class="example">
-    <pre highlight="html">
-      &lt;main role="main"&gt;
-        ...
-      &lt;/main&gt;
-    </pre>
-  </div>
-
     In the following example, we see 2 articles about skateboards (the main topic of a Web page) the
     main topic content is identified by the use of the <{main}> element.