Extend NSH documentation to include the new options to the mount command

Documentation/NuttShell.html

@@ -8,7 +8,7 @@
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       <h1><big><font color="#3c34ec"><i>NuttShell (NSH)</i></font></big></h1>
-      <p>Last Updated: November 23, 2015</p>
+      <p>Last Updated: November 25, 2015</p>
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@@ -2058,7 +2058,7 @@ nsh&gt;
 
 <p><b>Command Syntax:</b></p>
 <ul><pre>
-mount -t &lt;fstype&gt; &lt;block-device&gt; <code>&lt;dir-path&gt;</code>
+mount -t &lt;fstype&gt; [-o &lt;options&gt;] &lt;block-device&gt; <code>&lt;dir-path&gt;</code>
 </pre></ul>
 <p>
   <b>Synopsis</b>.