Update content/ja/docs/reference/glossary/feature-gates.md

Co-authored-by: inukai <82919057+t-inu@users.noreply.github.com>

content/ja/docs/reference/glossary/feature-gates.md

@@ -1,5 +1,5 @@
 ---
-title: フィーチャーゲート（Feature gate）
+title: フィーチャーゲート(Feature gate)
 id: feature-gate
 date: 2023-01-12
 full_link: /ja/docs/reference/command-line-tools-reference/feature-gates/