Update release number to 9.2.5

Author: bourtemb

cppapi/doxygen/Doxyfile

@@ -38,7 +38,7 @@ PROJECT_NAME           = "Tango Core Classes Reference "
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 9.3.0
+PROJECT_NUMBER         = 9.2.5
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a