docs: fix api docs

[Priyanshuthapliyal2005]

Closes #16067

fix the issue of Documentation on missing Applications is not clear i.e api-docs.
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).
• The title of the PR conforms to the Toolchain Guide
• 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.
• I have signed off all my commits as required by DCO
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• My build is green (troubleshooting builds).
• 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.

[ashutosh16]

LGTM

[ashutosh16]

@Priyanshuthapliyal2005 Fix the PR title - https://argo-cd.readthedocs.io/en/stable/developer-guide/toolchain-guide/#title-of-the-pr

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9a01a1a) 49.54% compared to head (d4c7195) 49.54%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #16186   +/-   ##
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  Coverage   49.54%   49.54%           
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  Files         269      269           
  Lines       46891    46891           
=======================================
  Hits        23233    23233           
  Misses      21376    21376           
  Partials     2282     2282           

see 1 file with indirect coverage changes

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[ishitasequeira]

LGTM!