doc: Fix namespace version to 5.0.1 for qhp documentation

Change-Id: I1aa4d8dfd2f89707b1451d7b083e5b98243df9a3
Reviewed-by: hjk <qthjk@ovi.com>

src/imageformats/doc/qtimageformats.qdocconf

@@ -31,7 +31,7 @@ qhp.qtimageformats.file = qtimageformats.qhp
 # different documentation files in Creator/Assistant. The namespace ends with
 # a version being a number containing a major, minor and revision element.
 # E.g. version 1.0 becomes 100.
-qhp.qtimageformats.namespace = org.qt-project.qtimageformats.500
+qhp.qtimageformats.namespace = org.qt-project.qtimageformats.501
 
 # Title for the package, will be the main title for the package in
 # Assistant/Creator.