string-functions: update ASCII() and BIN()

[shawn0915]

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Fix pingcap/docs#15418

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[shawn0915]

/label 2024-tidb-docs-dash

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-01-11 10:13:42.811602213 +0000 UTC m=+524612.395855902: ☑️ agreed by qiancai.

[qiancai]

Hi @shawn0915, thanks for fixing the issues.👍

I removed the Docs Dash label, but this will count towards your TiDB Docs Dash contribution for opening a new PR. https://github.com/orgs/pingcap/projects/51/views/11

[xzhangxian1008]

LGTM

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[qiancai]

/approve

[ti-chi-bot]

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