Help: Add `versionadded` for `CPACK_RPM_REQUIRES_EXCLUDE_FROM` variable

Help/cpack_gen/rpm.rst

@@ -1042,6 +1042,8 @@ Source RPM packaging has its own set of variables:
 
 .. variable:: CPACK_RPM_REQUIRES_EXCLUDE_FROM
 
+ .. versionadded:: 3.22
+
  * Mandatory : NO
  * Default   : -