Update ballerina-library word in lang repo

[praneesha]

Purpose

Update ballerina-library word in lang repo.

Fixes #

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

All modified lines are covered by tests ✅

Comparison is base (37801b4) 76.35% compared to head (9d6977f) 76.36%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #41445   +/-   ##
=========================================
  Coverage     76.35%   76.36%           
- Complexity    52515    52516    +1     
=========================================
  Files          2881     2881           
  Lines        198484   198484           
  Branches      25803    25803           
=========================================
+ Hits         151556   151563    +7     
+ Misses        38566    38561    -5     
+ Partials       8362     8360    -2     

Files	Coverage Δ
...llerinalang/docgen/docs/BallerinaDocGenerator.java	54.42% <ø> (ø)

... and 6 files with indirect coverage changes

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