Fix docs for yum_repository.py (#59068)

* The description has been replaced with proxy_password and proxy_username.
* Rename 59068-fix doc for yum_repository.py to 59068-fix_doc_for_yum_repository.yml

changelogs/fragments/59068-fix_doc_for_yum_repository.yml

@@ -0,0 +1,2 @@
+bugfixes:
+- Fix doc for proxy_username and proxy_password in yum_repository.py (https://github.com/ansible/ansible/pull/59068).

lib/ansible/modules/packaging/os/yum_repository.py

@@ -227,10 +227,10 @@ options:
         disable the global proxy setting.
   proxy_password:
     description:
-      - Username to use for proxy.
+      - Password for this proxy.
   proxy_username:
     description:
-      - Password for this proxy.
+      - Username to use for proxy.
   repo_gpgcheck:
     description:
       - This tells yum whether or not it should perform a GPG signature check