br: remove experimental feature notice for encryption to GA in v8.5

[Tristan1900]

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[Tristan1900]

@Oreoxmt could you take a quick look when you get a chance? Thank you!

[Oreoxmt]

LGTM

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[LGTM Timeline notifier]

Timeline:

• 2024-11-14 06:43:45.690679268 +0000 UTC m=+511387.881548265: ☑️ agreed by qiancai.
• 2024-11-19 03:08:53.673332642 +0000 UTC m=+930495.864201639: ☑️ agreed by Oreoxmt.

[qiancai]

/approve

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