[Docs] Update check commands in Japanese documents (#7787)

The Japanese documents included a sample command to check the original document changes. But there was something wrong, so I fixed it.

1 files changed, 1 insertions, 1 deletions

diff --git a/docs/ja/newbs_git_resynchronize_a_branch.md b/docs/ja/newbs_git_resynchronize_a_branch.md
index 747fe1e61..80ae794a9 100644
--- a/docs/ja/newbs_git_resynchronize_a_branch.md
+++ b/docs/ja/newbs_git_resynchronize_a_branch.md
@@ -3,7 +3,7 @@
 <!---
   grep --no-filename "^[ ]*git diff" docs/ja/*.md | sh
   original document: adf4acf59:docs/newbs_git_resynchronize_a_branch.md
-  git diff adf4acf59 HEAD docs/newbs_git_resynchronize_a_branch.md | cat
+  git diff adf4acf59 HEAD -- docs/newbs_git_resynchronize_a_branch.md | cat
 -->
 
 仮にあなたの `master` ブランチにあなたのコミットを行い、そしてあなたの QMK リポジトリの更新が必要になったとします。