[Docs] Fix broken links in docs.yugabyte.com

[def-]

Found with linkchecker: https://wummel.github.io/linkchecker/

Only on latest docs, the others are not allowed based on
https://docs.yugabyte.com/robots.txt:

Sitemap: https://docs.yugabyte.com/sitemap.xml
User-agent: *
Disallow: /latest/api/ysql/syntax_resources/
Allow: /latest/api/ysql/syntax_resources/grammar_diagrams/
# don't index the non-latest docs
Disallow: /v1.3/
Disallow: /v2.0/
Disallow: /v2.1/
Disallow: /v2.2/
Disallow: /v2.4/
Disallow: /v2.6/
Disallow: /v2.8/
Disallow: /stable/

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[polarweasel]

Thank you! Will review.

Incidentally, it looks like the linkchecker version you used has been abandoned since 2016. There's an actively-maintained version at https://github.com/linkchecker/linkchecker. I'll try it out.

[def-]

My bad, I actually used the one you linked to, didn't realize the other website is out-of-date.

$ linkchecker --version
LinkChecker 10.1.0 released 2022-01-28
Copyright (C) 2000-2016 Bastian Kleineidam, 2010-2021 LinkChecker Authors

[polarweasel]

I think we can close this one now that #11621 is merged. Linkchecker ran cleanly (internal links only) for me on the PR for that one.