add IanCheah as a contributor for doc

[allcontributors]

Adds @IanCheah as a contributor for doc.

This was requested by lhw-1 in this comment

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.89%. Comparing base (c91f282) to head (3d05e37).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2645   +/-   ##
=======================================
  Coverage   51.89%   51.89%           
=======================================
  Files         127      127           
  Lines        5475     5475           
  Branches     1202     1202           
=======================================
  Hits         2841     2841           
  Misses       2339     2339           
  Partials      295      295           

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[lhw-1]

LGTM

[github-actions]

@lhw-1 Each PR must have a SEMVER impact label, please remember to label the PR properly.