PULL_REQUEST_TEMPLATE.md: fix spelling

[jbampton]

Description

This PR fixes a single spelling mistake. I see it every time I create a pull request :)

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (improves an existing feature and functionality)
• Cleanup (Code refactoring and cleanup, that may add test cases)
• build/CI

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

• Major
• Minor

Bug Severity

• BLOCKER
• Critical
• Major
• Minor
• Trivial

Screenshots (if appropriate):

How Has This Been Tested?

How did you try to break this feature and the system with this change?

[codecov]

Codecov Report

Merging #8220 (971fa58) into main (30ca5d1) will increase coverage by 0.06%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main    #8220      +/-   ##
============================================
+ Coverage     29.05%   29.11%   +0.06%     
- Complexity    30900    30974      +74     
============================================
  Files          5186     5186              
  Lines        365785   365785              
  Branches      53489    53489              
============================================
+ Hits         106264   106491     +227     
+ Misses       244966   244701     -265     
- Partials      14555    14593      +38     

Flag	Coverage Δ
simulator-marvin-tests	25.05% <ø> (+0.07%)	⬆️
uitests	4.50% <ø> (ø)
unit-tests	14.80% <ø> (ø)

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see 42 files with indirect coverage changes

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