docs(web-components): add missed storybook import extensions

[abdonrd]

The plain ESM standard imports should have extensions.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.07%. Comparing base (e8c7672) to head (07a54ad).
Report is 10 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #17656   +/-   ##
=======================================
  Coverage   77.07%   77.07%           
=======================================
  Files         409      409           
  Lines       14021    14021           
  Branches     4355     4327   -28     
=======================================
  Hits        10807    10807           
  Misses       3043     3043           
  Partials      171      171           

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[carbon-automation]

Hey there! v11.68.0 was just released that references this issue/PR.