[stable-2.9] find - clarify description of 'contains' (#62445) (#62917)

(cherry picked from commit 2375fd0990)

Co-authored-by: Sam Doran <sdoran@redhat.com>

changelogs/fragments/find-contains-docs.yaml

@@ -0,0 +1,2 @@
+bugfixes:
+  - find - clarify description of ``contains`` (https://github.com/ansible/ansible/issues/61983)

lib/ansible/modules/files/find.py

@@ -56,7 +56,7 @@ options:
         version_added: "2.5"
     contains:
         description:
-            - One or more regex patterns which should be matched against the file content.
+            - A regular expression or pattern which should be matched against the file content.
         type: str
     paths:
         description: