chore(example): use full links in GitHub templates

[orhun]

Description

Use full PR links in the changelog that is generated from GitHub templates

Motivation and Context

closes #487

How Has This Been Tested?

-

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (no code change)
• Refactor (refactoring production code)
• Other

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have formatted the code with rustfmt.
• I checked the lints with clippy.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (bd5e4d2) 41.30% compared to head (6126473) 41.30%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #503   +/-   ##
=======================================
  Coverage   41.30%   41.30%           
=======================================
  Files          15       15           
  Lines        1034     1034           
=======================================
  Hits          427      427           
  Misses        607      607           

Flag	Coverage Δ
unit-tests	41.30% <ø> (ø)

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