[MINOR] docs: Fix the docs about model privilege (#7555)

### What changes were proposed in this pull request?

Fix the docs about model privilege

### Why are the changes needed?

Just a minor.

### Does this PR introduce _any_ user-facing change?

No.

### How was this patch tested?

Code review.

Co-authored-by: roryqi <[email protected]>

Author: github-actions[bot]

docs/security/access-control.md

@@ -101,6 +101,7 @@ The metadata object that supports ownership is as follows:
 | Topic                |
 | Fileset              |
 | Role                 |
+| Model                |
 
 ### User
 Users are generally granted one or multiple Roles, and users have different operating privileges depending on their Role.