IVGCVSW-5694 Update Major, Minor release versions

   * Update Arm NN version in Version.hpp and all guides
   * Change Project Version in Doxyfile

Signed-off-by: Nikhil Raj <nikhil.raj@arm.com>
Change-Id: I05ab20a1ae5d0376a641df68a5877f97e7609052
diff --git a/docs/Doxyfile b/docs/Doxyfile
index cfd2e67..31f06f7 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         = 20.11
+PROJECT_NUMBER         = 21.02
 
 # 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