Add Eeshaan to docs approvers group

[khanhtc1202]

What this PR does:

Eeshaan has made significant contributions to the PipeCD docs, and I would like to promote him to approver for the docs.
Thanks @eeshaanSA 🚀

Why we need it:

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

• How are users affected by this change:
• Is this breaking change:
• How to migrate (if breaking change):

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 28.86%. Comparing base (60e575b) to head (9ddf255).
⚠️ Report is 21 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6405      +/-   ##
==========================================
- Coverage   28.87%   28.86%   -0.01%     
==========================================
  Files         532      560      +28     
  Lines       57552    59955    +2403     
==========================================
+ Hits        16620    17309     +689     
- Misses      39663    41324    +1661     
- Partials     1269     1322      +53     

Flag	Coverage Δ
.	23.29% <ø> (ø)
.-pkg-app-pipedv1-plugin-analysis	32.64% <ø> (ø)
.-pkg-app-pipedv1-plugin-kubernetes	58.67% <ø> (ø)
.-pkg-app-pipedv1-plugin-kubernetes_multicluster	67.63% <ø> (ø)
.-pkg-app-pipedv1-plugin-scriptrun	54.83% <ø> (?)
.-pkg-app-pipedv1-plugin-terraform	38.65% <ø> (?)
.-pkg-app-pipedv1-plugin-wait	33.92% <ø> (?)
.-pkg-app-pipedv1-plugin-waitapproval	52.71% <ø> (ø)
.-pkg-plugin-sdk	50.14% <ø> (ø)
.-tool-actions-gh-release	19.23% <ø> (?)
.-tool-actions-plan-preview	25.51% <ø> (?)
.-tool-codegen-protoc-gen-auth	0.00% <ø> (?)

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[Warashi]

Sorry for late review, LGTM 👍

[khanhtc1202]

@ffjlabo @t-kikuc please review and approve this request, thanks 🙏