Add details for Hexadecimal Literals (#5620)

[ti-srebot]

cherry-pick #5620 to master
You can switch your code base to this Pull Request by using git-extras:

# In docs-cn repo:
git pr https://github.com/pingcap/docs-cn/pull/6072

After apply modifications, you can push your change to this PR via:

git push [email protected]:ti-srebot/docs-cn.git pr/6072:master-16e9588a5127

---

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Do your changes match any of the following descriptions?

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• Might cause conflicts after applied to another branch

[ti-srebot]

@zoujia-cm please accept the invitation then you can push to the cherry-pick pull requests.
https://github.com/ti-srebot/docs-cn/invitations

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• yikeke

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[yikeke]

/merge

[ti-chi-bot]

@yikeke: /merge in this pull request requires 2 /lgtm.

In response to this:

/merge

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[yikeke]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 52b027e