Update Doxygen Project Version

Signed-off-by: Nikhil Raj <nikhil.raj@arm.com>
Change-Id: I936fa3c7f7f2b7bc6e47b29f59ac66d6d94f2dae
diff --git a/docs/Doxyfile b/docs/Doxyfile
index 7dd51b5..dd87daa 100644
--- a/docs/Doxyfile
+++ b/docs/Doxyfile
@@ -61,7 +61,7 @@
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 21.11
+PROJECT_NUMBER         = 22.02
 
 # 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