Update reducing-repo-size page with more info

doc/user/project/repository/reducing_the_repo_size_using_git.md

@@ -18,7 +18,7 @@ Such problems can be detected with [git-sizer](https://github.com/github/git-siz
 Rewriting a repository can remove unwanted history to make the repository smaller.
 We **recommend [`git filter-repo`](https://github.com/newren/git-filter-repo/blob/main/README.md)**
 over [`git filter-branch`](https://git-scm.com/docs/git-filter-branch) and
-[BFG](https://rtyley.github.io/bfg-repo-cleaner/).
+[BFG](https://rtyley.github.io/bfg-repo-cleaner/). 
 
 WARNING:
 Rewriting repository history is a destructive operation. Make sure to back up your repository before
@@ -63,6 +63,12 @@ To purge files from a GitLab repository:
    git clone --bare --mirror /path/to/project.bundle
    ```
 
+1. Navigate to the `project.git` directory:
+
+   ```shell
+   cd project.git
+   ```
+
 1. Using `git filter-repo`, purge any files from the history of your repository. Because we are
    trying to remove internal refs, we rely on the `commit-map` produced by each run to tell us
    which internal refs to remove.