Doc: Add "\inmodule QtCreator" to \class and \namespace docs

To get rid of QDoc warnings.

Change-Id: Idd39b7ae4327798c376f424c94d6617bcaee2258
Reviewed-by: hjk <hjk@qt.io>

src/libs/utils/completingtextedit.cpp

@@ -13,7 +13,9 @@ static bool isEndOfWordChar(const QChar &c)
     return !c.isLetterOrNumber() && c.category() != QChar::Punctuation_Connector;
 }
 
-/*! \class Utils::CompletingTextEdit
+/*!
+  \class Utils::CompletingTextEdit
+  \inmodule QtCreator
 
   \brief The CompletingTextEdit class is a QTextEdit with auto-completion
   support.