Document configurable LFS BATCH_SIZE and MAX_BATCH_SIZE.

Signed-off-by: Royce Remer <royceremer@gmail.com>

docs/administration/config-cheat-sheet.md

@@ -372,6 +372,7 @@ The following configuration set `Content-Type: application/vnd.android.package-a
 - `LFS_HTTP_AUTH_EXPIRY`: **24h**: LFS authentication validity period in time.Duration, pushes taking longer than this may fail.
 - `LFS_MAX_FILE_SIZE`: **0**: Maximum allowed LFS file size in bytes (Set to 0 for no limit).
 - `LFS_LOCKS_PAGING_NUM`: **50**: Maximum number of LFS Locks returned per page.
+- `LFS_MAX_BATCH_SIZE`: **0**: The maximum number of LFS pointers that a client may request of the LFS batch api. Zero is the default behavior and allows any size batch.
 
 - `REDIRECT_OTHER_PORT`: **false**: If true and `PROTOCOL` is https, allows redirecting http requests on `PORT_TO_REDIRECT` to the https port Gitea listens on.
 - `REDIRECTOR_USE_PROXY_PROTOCOL`: **%(USE_PROXY_PROTOCOL)s**: expect PROXY protocol header on connections to https redirector.
@@ -1321,6 +1322,10 @@ is `data/lfs` and the default of `MINIO_BASE_PATH` is `lfs/`.
 - `MINIO_INSECURE_SKIP_VERIFY`: **false**: Minio skip SSL verification available when STORAGE_TYPE is `minio`
 - `MINIO_BUCKET_LOOKUP_TYPE`: **auto**: Minio bucket lookup method defaults to auto mode; set it to `dns` for virtual host style or `path` for path style, only available when STORAGE_TYPE is `minio`
 
+## LFS Client (`lfs_client`)
+
+- `BATCH_SIZE`: **20**: The number of LFS pointers to request per batch API request of an upstream mirror.
+
 ## Storage (`storage`)
 
 Default storage configuration for attachments, lfs, avatars, repo-avatars, repo-archive, packages, actions_log, actions_artifact. It's recommended to only configure this section and let other section derive from this one if all storages