[Documentation][zos_data_set] Add and standarize docstrings on modules/zos_data_set.py (#1347)

* First advance to docstrings on modules/zos_data_set.py

* Add and standarize docstrings on modules/zos_data_set.py

* Create changelog fragment

* Modify google style to numpy

* Standarize numpy style

* Modified docstrings

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

Author: IsaacVRey

changelogs/fragments/1347-update-docstring-zos_data_set.yml

@@ -0,0 +1,3 @@
+trivial:
+  - zos_data_set - Updated docstrings to numpy style for visual aid to developers.
+    (https://github.com/ansible-collections/ibm_zos_core/pull/1347).