Fix branch API table format

doc/api/branches.md

@@ -22,6 +22,7 @@ Parameters:
 |:----------|:---------------|:---------|:------------|
 | `id`      | integer/string | yes      | ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) owned by the authenticated user.|
 | `search`  | string         | no       | Return list of branches containing the search string. You can use `^term` and `term$` to find branches that begin and end with `term` respectively.|
+
 Example request:
 
 ```sh