Fix link in flyteidl README.md

[amitani]

Tracking issue

N/A

Why are the changes needed?

Current link is broken.

What changes were proposed in this pull request?

Fix the link.

How was this patch tested?

Link works in preview.

Setup process

Screenshots

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

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[davidmirror-ops]

Thank you

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.81%. Comparing base (636cc23) to head (c6d12fd).
Report is 8 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5957   +/-   ##
=======================================
  Coverage   36.81%   36.81%           
=======================================
  Files        1310     1310           
  Lines      131034   131034           
=======================================
  Hits        48237    48237           
  Misses      78611    78611           
  Partials     4186     4186           

Flag	Coverage Δ
unittests-datacatalog	51.58% <ø> (ø)
unittests-flyteadmin	54.04% <ø> (ø)
unittests-flytecopilot	11.73% <ø> (ø)
unittests-flytectl	62.39% <ø> (ø)
unittests-flyteidl	6.92% <ø> (ø)
unittests-flyteplugins	53.64% <ø> (ø)
unittests-flytepropeller	42.90% <ø> (ø)
unittests-flytestdlib	55.41% <ø> (ø)

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