[Documentation][data_set] Add and standarize docstrings on module-utils/data_set.py (#1389)

* Add and standarize docstrings on module-utils/data_set.py

* Add x

---------

Co-authored-by: Fernando Flores <[email protected]>
Co-authored-by: André Marcel Gutiérrez Benítez <[email protected]>

Author: 3 people

changelogs/fragments/1389-update-docstring-data_set.yml

@@ -0,0 +1,3 @@
+trivial:
+  - data_set - Updated docstrings to numpy style for visual aid to developers.
+    (https://github.com/ansible-collections/ibm_zos_core/pull/1389).