Update doxygen config

Author: kenneth-jia

scripts/doxyfile.cfg

@@ -1239,7 +1239,7 @@ HTML_COLORSTYLE_GAMMA  = 80
 # The default value is: NO.
 # This tag requires that the tag GENERATE_HTML is set to YES.
 
-HTML_TIMESTAMP         = NO
+HTML_TIMESTAMP         = YES
 
 # If the HTML_DYNAMIC_MENUS tag is set to YES then the generated HTML
 # documentation will contain a main index with vertical navigation menus that