[Documentation][zos_copy] Document copy behavior of 'SOME.TEST.PDS(*)' as source (#1970)

* Updated docs

* Added changelog

* Corrected zos_copy

Author: fernandofloresg

changelogs/fragments/1970-update-zos_copy-wildcard.yml

@@ -0,0 +1,3 @@
+trivial:
+  - zos_copy - Document copy behavior of 'SOME.TEST.PDS(*)' in zos_copy.
+    (https://github.com/ansible-collections/ibm_zos_core/pull/1970).

plugins/modules/zos_copy.py

@@ -322,7 +322,8 @@
       - If C(src) is a generation data group (GDG), C(dest) can be another GDG or a USS
         directory.
       - Wildcards can be used to copy multiple PDS/PDSE members to another
-        PDS/PDSE.
+        PDS/PDSE. i.e. Using SOME.TEST.PDS(*) will copy all members from one PDS/E
+        to another without removing the destination PDS/E.
       - Required unless using C(content).
     type: str
   validate: