clarify nested namespaces

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@9448 626c5289-ae23-0410-ae9c-e8d60b6d4f22

SWIG/Doc/Manual/CSharp.html

@@ -77,6 +77,14 @@ The <tt>-package</tt> command line option does not exist.
 
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 The <tt>-namespace &lt;name&gt;</tt> commandline option will generate all code into the namespace specified by <tt>&lt;name&gt;</tt>.
+C# supports nested namespaces that are not lexically nested, so nested namespaces will of course also work. For example:
+<tt>-namespace com.bloggs.widget</tt>, will generate code into C# namespaces:
+
+<div class="code"><pre>
+namespace com.bloggs.widget {
+  ...
+}
+</pre></div>
 </li>
 
 <li>