Update Doxyfile

docs/Doxyfile

@@ -824,7 +824,7 @@ FILE_PATTERNS          = *.py
 # be searched for input files as well.
 # The default value is: NO.
 
-RECURSIVE              = NO
+RECURSIVE              = YES
 
 # The EXCLUDE tag can be used to specify files and/or directories that should be
 # excluded from the INPUT source files. This way you can easily exclude a