Add comments for semver regex

[pmahindrakar-oss]

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• I updated the documentation accordingly.
• All new and existing tests passed.
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.29%. Comparing base (2d9c35b) to head (689843b).
Report is 157 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5758      +/-   ##
==========================================
- Coverage   36.30%   36.29%   -0.01%     
==========================================
  Files        1305     1305              
  Lines      109997   109997              
==========================================
- Hits        39930    39927       -3     
- Misses      65911    65914       +3     
  Partials     4156     4156              

Flag	Coverage Δ
unittests-datacatalog	51.37% <ø> (ø)
unittests-flyteadmin	55.62% <ø> (ø)
unittests-flytecopilot	12.17% <ø> (ø)
unittests-flytectl	62.21% <ø> (-0.05%)	⬇️
unittests-flyteidl	7.12% <ø> (ø)
unittests-flyteplugins	53.35% <ø> (ø)
unittests-flytepropeller	41.88% <ø> (ø)
unittests-flytestdlib	55.21% <ø> (ø)

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[katrogan]

thank you!