fix su localization option [2.10] (#73878)

* fix su localization optoin

  fixes #73837

(cherry picked from commit 37cb550185)

* Update su_fix.yml

Co-authored-by: Rick Elrod <rick@elrod.me>

changelogs/fragments/su_fix.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - su become plugin - ensure correct type for localization option (https://github.com/ansible/ansible/issues/73837).

lib/ansible/plugins/become/su.py

@@ -72,6 +72,7 @@ DOCUMENTATION = """
                 - List of localized strings to match for prompt detection
                 - If empty we'll use the built in one
             default: []
+            type: list
             ini:
               - section: su_become_plugin
                 key: localized_prompts