Update icon and change the label of the parameter in generate API

[SasinduDilshara]

Related to ballerina-platform/ballerina-library#8124 and ballerina-platform/ballerina-library#8125

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.43%. Comparing base (3caa866) to head (2921120).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #16   +/-   ##
=======================================
  Coverage   50.43%   50.43%           
=======================================
  Files           3        3           
  Lines         347      347           
  Branches      105      105           
=======================================
  Hits          175      175           
  Misses        172      172           

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