Documentation bugfix of invalid JSON payload example of Create a commit with...

Documentation bugfix of invalid JSON payload example of Create a commit with multiple files and actions

changelogs/unreleased/fix_docs_commits_multiple_files.yml

+---
+title: Documentation bugfix of invalid JSON payload example of Create a commit with
+  multiple files and actions
+merge_request: 12117
+author: @blackst0ne

doc/api/commits.md

@@ -97,7 +97,7 @@ PAYLOAD=$(cat << 'JSON'
     },
     {
       "action": "delete",
-      "file_path": "foo/bar2",
+      "file_path": "foo/bar2"
     },
     {
       "action": "move",