doc(lockfile): Document `--lockfile-path` flag

docs/pages/cli/general.md

@@ -34,3 +34,11 @@ With `--restic-bin` you can specify to run a specific restic binary. This can be
 ```bash
 autorestic --restic-bin /some/path/to/my/custom/restic/binary
 ```
+
+## `--lockfile-path`
+
+Specify the path for the lockfile used by `autorestic`. If omitted, this will default to `.autorestic.lock.yml` next to the loaded config file.
+
+```bash
+autorestic --lockfile-path /path/to/my/.autorestic.lock.yml
+```