docs: releaseName is now required by helm-template

[jessesuen]

#2628 made releaseName mandatory, but docs still say it is optional.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.33%. Comparing base (9c17446) to head (29b8ee3).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3645   +/-   ##
=======================================
  Coverage   52.33%   52.33%           
=======================================
  Files         299      299           
  Lines       26935    26935           
=======================================
  Hits        14097    14097           
  Misses      12078    12078           
  Partials      760      760           

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[akuitybot]

Successfully created backport PR for release-1.3:

• chore(backport release-1.3): docs: releaseName is now required by helm-template #3648