Update changes file for 5.0.1 release

Change-Id: If70f67f3b8f9a2230cccff8a2682a7f1dcecfb73
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>

dist/changes-5.0.1

@@ -22,14 +22,13 @@ information about a particular change.
 General Improvements
 --------------------
 
+ - [QTBUG-28633] Fix bogus include paths in some pkg-config files
+ - [QTBUG-28689] Fix help URLs in tools.
+ - [QTBUG-28579] Doc: Correcting qhp links to the Linguist and Assistant examples
+
 Third party components
 ----------------------
 
-****************************************************************************
-*                          Library                                         *
-****************************************************************************
-
-
 ****************************************************************************
 *                      Platform Specific Changes                           *
 ****************************************************************************
@@ -44,9 +43,22 @@ Third party components
 *                          Tools                                           *
 ****************************************************************************
 
+Qt Assistant
+------------
+
+ - Fix warnings found by the headersclean test
+ - Move functions from an anonymous namespace in a header
+
+Qt DBus Viewer
+--------------
+
+ - Try harder in matching the method signature
+
 Qt Designer
 -----------
 
+ - Fix warning about hidden overloaded virtual, found by Clang
+
 Qt Help
 -------