Fix Static Role Name Consistency in PostgreSQL Configuration (#29138)

* Updated the PostgreSQL database creation command to ensure the static role name is consistent.

The role name specified in allowed_roles="my-role" under the section "Rootless Configuration and Password Rotation for Static Roles" should align with the static role name in step #3. Previously, the command incorrectly used "my-static-role"; it should be "my-role" to match the earlier step.

The same role name should also be used when reading the static credentials in step #4

* Added the file changelog/29138.txt

* Delete changelog/29138.txt

---------

Co-authored-by: Yoko Hyakuna <[email protected]>
Co-authored-by: akshya96 <[email protected]>
Co-authored-by: Violet Hynes <[email protected]>

website/content/docs/secrets/databases/postgresql.mdx

@@ -128,7 +128,7 @@ DB in order to resolve any errors encountered during rotation.
     the `self_managed_password` parameter:
 
     ```shell-session
-    $ vault write database/static-roles/my-static-role \
+    $ vault write database/static-roles/my-role \
       db_name="my-postgresql-database" \
       username="staticuser" \
       self_managed_password="password" \
@@ -138,7 +138,7 @@ DB in order to resolve any errors encountered during rotation.
 1.  Read static credentials:
 
     ```shell-session
-    $ vault read database/static-creds/static-test
+    $ vault read database/static-creds/my-role
     Key                    Value
     ---                    -----
     last_vault_rotation    2024-09-11T14:15:13.764783-07:00