Improve documentations for tolerate-non-existent-backend-{service,action}

[guessi]

Issue

#3440

Description

See #3440 for more details.

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the docs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[k8s-ci-robot]

Hi @guessi. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

I understand the commands that are listed here.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[oliviassss]

/lgtm
/assign @M00nF1sh

[M00nF1sh]

/lgtm
/approve

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (276c693) 55.75% compared to head (bedddc7) 55.75%.
Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3442   +/-   ##
=======================================
  Coverage   55.75%   55.75%           
=======================================
  Files         149      149           
  Lines        8838     8838           
=======================================
  Hits         4928     4928           
  Misses       3576     3576           
  Partials      334      334           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[guessi]

@oliviassss @M00nF1sh

I've rebase the commit, and tried to shorten my commit message to get do-not-merge/invalid-commit-message check pass, but it doesn't looks like it could make bot happy. Let me know what should I do next, thanks!

[guessi]

Umm... looks like it violate this rule, let me try again.

[guessi]

Nice, do-not-merge/invalid-commit-message removed, but /lgtm removed as well... 😶‍🌫️

[guessi]

/retest

[M00nF1sh]

/lgtm
/approve
thanks for making this contribution

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: guessi, M00nF1sh

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

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [M00nF1sh]

Approvers can indicate their approval by writing /approve in a comment
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