i18n(ja): fix dropdown word split by stray bold-span boundary

[yahonda]

What is changed

In tidb-cloud/changefeed-sink-to-cloud-storage.md, the bold span around the "Select a role" label incorrectly cut through the compound word ドロップダウン (dropdown), trapping ドロップ inside the closing ** and leaving ダウン outside:

**「役割を選択」ドロップ**ダウンリストに、...

This reads as an unnatural mid-word emphasis break. Fixed to bold only the UI label, matching every other ドロップダウンリスト occurrence in the corpus (confirmed via corpus-wide grep — this was the only split instance out of 50+ occurrences):

**「役割を選択」**ドロップダウンリストに、...

EN reference: "In the Select a role drop-down list, type the name of the IAM role you just created, and then choose the name from the filter result."

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[LGTM Timeline notifier]

Timeline:

• 2026-08-18 06:14:21.753679349 +0000 UTC m=+3718247.789774395: ☑️ agreed by qiancai.