feat: Update health documentation

[pierreyves-lebrun]

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• The title of the PR states what changed and the related issues number (used for the release note).
• I've included "Closes [ISSUE #]" or "Fixes [ISSUE #]" in the description to automatically close the associated issue.
• I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
• Does this PR require documentation updates?
• I've updated documentation as required by this PR.
• Optional. My organization is added to USERS.md.
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• My new feature complies with the feature status guidelines.
• I have added a brief description of why this PR is necessary and/or what this PR solves.

This PR update the health documentation regarding how to enable LUA standard library for custom health checks

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.16 ⚠️

Comparison is base (4def3b8) 49.09% compared to head (789591e) 48.93%.

❗ Current head 789591e differs from pull request most recent head 1542c57. Consider uploading reports for the commit 1542c57 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #12996      +/-   ##
==========================================
- Coverage   49.09%   48.93%   -0.16%     
==========================================
  Files         249      246       -3     
  Lines       43182    42429     -753     
==========================================
- Hits        21199    20764     -435     
+ Misses      19864    19555     -309     
+ Partials     2119     2110       -9     

see 47 files with indirect coverage changes

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