Doc: use standard wording in \brief commands

QDoc does some magic with the \class and \namespaces
and \brief commands, so the following wording must be used:
"The xxx class yyy ..."

Change-Id: Id231f30e8464898b776888d5423523de404aae34
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/libs/qmljs/qmljsvalueowner.cpp

@@ -35,7 +35,7 @@ using namespace QmlJS;
 
 /*!
     \class QmlJS::ValueOwner
-    \brief Manages the lifetime of \l{QmlJS::Value}s.
+    \brief The ValueOwner class manages the lifetime of \l{QmlJS::Value}s.
     \sa QmlJS::Value
 
     Values are usually created on a ValueOwner. When the ValueOwner is destroyed