[Documentation][copy] Add and standarize docstrings on modules/copy.py (#1387)

* Add and standarize docstrings on modules/copy.py

* Add changelog fragment

* Fixed docstrings

---------

Co-authored-by: Fernando Flores <[email protected]>

Author: IsaacVRey

changelogs/fragments/1387-update-docstring-copy.yml

@@ -0,0 +1,3 @@
+trivial:
+  - copy - Updated docstrings to numpy style for visual aid to developers.
+    (https://github.com/ansible-collections/ibm_zos_core/pull/1387).