Update flytefile.md

[wild-endeavor]

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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 61.09%. Comparing base (75b33f8) to head (668ef1d).
Report is 138 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5428      +/-   ##
==========================================
- Coverage   61.99%   61.09%   -0.90%     
==========================================
  Files         611      793     +182     
  Lines       36388    51169   +14781     
==========================================
+ Hits        22559    31263    +8704     
- Misses      11863    17034    +5171     
- Partials     1966     2872     +906     

Flag	Coverage Δ
unittests-datacatalog	69.31% <ø> (ø)
unittests-flyteadmin	58.86% <ø> (?)
unittests-flytecopilot	17.79% <ø> (ø)
unittests-flytectl	68.34% <ø> (ø)
unittests-flyteidl	79.30% <ø> (ø)
unittests-flyteplugins	61.94% <ø> (ø)
unittests-flytepropeller	57.32% <ø> (+0.02%)	⬆️
unittests-flytestdlib	65.80% <ø> (-0.03%)	⬇️

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[eapolinario]

another error:

/home/runner/work/flyte/flyte/flyte/docs/user_guide/extending/custom_types.md:10079:Line number spec is out of range (1 - 119)