Added Max attachment size to limit settings

doc/user/gitlab_com/index.md

@@ -115,6 +115,7 @@ or over the repository size limit, you can [reduce your repository size with Git
 | -----------                   | ----------- | ------------- |
 | [Repository size including LFS](../admin_area/settings/account_and_limit_settings.md#repository-size-limit) | 10 GB       | Unlimited     |
 | Maximum import size           | 5 GB        | Unlimited ([Modified](https://gitlab.com/gitlab-org/gitlab/-/issues/251106) from 50MB to unlimited in GitLab 13.8.    |
+| Maximum attachment size       | 10 MB      |     10 MB   | 
 
 NOTE:
 `git push` and GitLab project imports are limited to 5 GB per request through Cloudflare. Git LFS and imports other than a file upload are not affected by this limit.