git: Document security risk involved in embedding user creds (#84963)

* Provide warning to user about the potential risk involved in
  embedding username and password in git URL while checking out the source.

Fixes: #84557

Signed-off-by: Abhijeet Kasurde <Akasurde@redhat.com>

lib/ansible/modules/git.py

@@ -21,6 +21,10 @@ options:
     repo:
         description:
             - git, SSH, or HTTP(S) protocol address of the git repository.
+            - Avoid embedding usernames and passwords within Git repository URLs.
+              This practice is insecure and can lead to unauthorized access to your repositories.
+              For secure authentication, configure SSH keys (recommended) or use a credential helper.
+              See Git documentation on SSH keys/credential helpers for instructions.
         type: str
         required: true
         aliases: [ name ]