Refine Documentation

[RNViththagan]

Purpose

This PR refines the ballerinax/paypal.subscriptions connector documentation by improving the account setup section and adding example symlinks, enhancing clarity and navigation for developers.

Changes

• Separated the note and image in the account setup section of README.md for improved readability.
• Updated .github/README.md with symlinks to example Markdown files in examples/create-and-list-plans/README.md and examples/monitor-and-manage-subscription/README.md.

Checklist

• Updated the changelog

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.43%. Comparing base (483b98e) to head (210f3d8).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #8   +/-   ##
=======================================
  Coverage   68.43%   68.43%           
=======================================
  Files           3        3           
  Lines         320      320           
  Branches       57       57           
=======================================
  Hits          219      219           
  Misses        101      101           

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