Update contributing guide

[karrtikr]

For #7002

[codecov-io]

Codecov Report

Merging #7202 into master will increase coverage by 0.29%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master   #7202      +/-   ##
=========================================
+ Coverage    58.2%   58.5%   +0.29%     
=========================================
  Files         486     486              
  Lines       21460   21460              
  Branches     3458    3463       +5     
=========================================
+ Hits        12491   12555      +64     
+ Misses       8188    8129      -59     
+ Partials      781     776       -5

Impacted Files	Coverage Δ
src/client/common/logger.ts	68.55% <0%> (-4.41%)	⬇️
src/client/language/characters.ts	33.33% <0%> (+2.56%)	⬆️
src/client/common/utils/version.ts	81.48% <0%> (+3.7%)	⬆️
src/client/providers/providerUtilities.ts	88.88% <0%> (+5.55%)	⬆️
src/client/datascience/cellFactory.ts	89.65% <0%> (+13.79%)	⬆️
src/client/common/utils/icons.ts	100% <0%> (+16.66%)	⬆️
src/client/formatters/serviceRegistry.ts	100% <0%> (+25%)	⬆️
src/client/api.ts	87.5% <0%> (+25%)	⬆️
...t/datascience/jupyter/jupyterDataRateLimitError.ts	100% <0%> (+33.33%)	⬆️
src/client/testing/codeLenses/main.ts	77.77% <0%> (+33.33%)	⬆️
... and 1 more

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