Change bal add generated code to adhere to best practices

[ShammiL]

Purpose

$Subject

Fixes #41775

Approach

Describe how you are implementing the solutions along with the design details.

Samples

Provide high-level details about the samples related to this feature.

Remarks

List any other known issues, related PRs, TODO items, or any other notes related to the PR.

Check List

• Read the Contributing Guide
• Updated Change Log
• Checked Tooling Support (#)
• Added necessary tests
  • Unit Tests
  • Spec Conformance Tests
  • Integration Tests
  • Ballerina By Example Tests
• Increased Test Coverage
• Added necessary documentation
  • API documentation
  • Module documentation in Module.md files
  • Ballerina By Examples

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (0823dc9) 0.00% compared to head (b9d2460) 76.71%.
Report is 88 commits behind head on master.

Files	Patch %	Lines
.../main/java/org/ballerinalang/docgen/Generator.java	50.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             master   #42136       +/-   ##
=============================================
+ Coverage      0.00%   76.71%   +76.71%     
- Complexity        0    53064    +53064     
=============================================
  Files             9     2883     +2874     
  Lines            35   199980   +199945     
  Branches          0    26033    +26033     
=============================================
+ Hits              0   153422   +153422     
- Misses           35    38113    +38078     
- Partials          0     8445     +8445     

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