improve list paremeter description. (#60948)

* improve list option description.

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

@@ -47,8 +47,9 @@ options:
     version_added: "2.0"
   list:
     description:
-      - "Package name to run the equivalent of yum list <package> against. In addition to listing packages,
+      - "Package name to run the equivalent of yum list --show-duplicates <package> against. In addition to listing packages,
         use can also list the following: C(installed), C(updates), C(available) and C(repos)."
+      - This parameter is mutually exclusive with C(name).
   state:
     description:
       - Whether to install (C(present) or C(installed), C(latest)), or remove (C(absent) or C(removed)) a package.