update the external links that contains master to release-5.0

[TomShawn]

What is changed, added or deleted? (Required)

Update the external GitHub links that contain /master/ and /release-3.0/ to /release-5.0/.

Which TiDB version(s) do your changes apply to? (Required)

• master (the latest development version)
• v5.0 (TiDB 5.0 versions)
• v4.0 (TiDB 4.0 versions)
• v3.1 (TiDB 3.1 versions)
• v3.0 (TiDB 3.0 versions)
• v2.1 (TiDB 2.1 versions)

What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s):

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[TomShawn]

/translation doing
/status PTAL
/assign
/cc @yikeke

[yikeke]

rest lgtm

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• yikeke

To complete the pull request process, please ask the reviewers in the list to review by filling /cc @reviewer in the comment.
After your PR has acquired the required number of LGTMs, you can assign this pull request to the committer in the list by filling /assign @committer in the comment to help you merge this pull request.

The full list of commands accepted by this bot can be found here.

Reviewer can indicate their review by writing /lgtm in a comment.
Reviewer can cancel approval by writing /lgtm cancel in a comment.

[TomShawn]

/label require-LGT1
/merge

[ti-chi-bot]

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

Commit hash: 687cbcc

[TomShawn]

/remove-translation doing
/translation done