Doc: Fix "Class QXmlNamePool has no \inmodule command"

All others in this folder use "\inmodule QtXmlPatterns"

Change-Id: I460cba6b91a49e2af00ab909bea5af11919e8386
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>

src/xmlpatterns/api/qxmlnamepool.cpp

@@ -50,6 +50,7 @@ QT_BEGIN_NAMESPACE
   \reentrant
   \since 4.4
   \ingroup xml-tools
+  \inmodule QtXmlPatterns
 
   QXmlNamePool is used to optimize operations on instances of
   QXmlName. An instance of QXmlName represents an XML name in