docs: add link to "Helper Functions"

kenjis · kenjis · commit bb1369a231ff · 2023-10-24T08:48:32.000+09:00
diff --git a/user_guide_src/source/helpers/index.rst b/user_guide_src/source/helpers/index.rst
@@ -3,6 +3,7 @@ Helpers
 #######
 
 Helpers are collections of useful procedural functions.
+See also :doc:`../general/helpers`.
 
 .. toctree::
     :glob:
