Update coding style

Documentation/NuttXCCodingStandard.html

@@ -12,7 +12,7 @@
       <h1><big><font color="#3c34ec">
         <i>NuttX C Coding Standard</i>
       </font></big></h1>
-      <p>Last Updated: March 9, 2014</p>
+      <p>Last Updated: July 28, 2015</p>
     </td>
   </tr>
 </table>
@@ -382,6 +382,22 @@
 
 <h2><a name="comments">1.3 Comments</a></h2>
 
+<p>
+  <b>General</b>.
+  Within a comment, the text must be standard English conforming to standard English rules or grammar and spelling (US English spelling).
+  Of course, this is not the place to summarize all English grammar, but as examples:
+</p>
+<ul>
+  <li>
+    All sentences should begin with an upper-case character and end with either '.', '?', or '!'.
+  </li>
+  <li>
+    Sentence fragments and phrases are generally treated the same as sentences.
+  </li>
+  <li>
+    The punctuation '.' and ':' is followed by two spaces; the punctuation ',' and ';' is followed by a single space.
+  </li>
+</ul>
 <p>
   <b>Line Spacing</b>
   A single blank line should precede and follow each comment.