docs: fix grammar and spelling in CONTRIBUTING.md

[jbampton]

Description

This PR...

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
• test (unit or integration test code)

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

All modified and coverable lines are covered by tests ✅

Project coverage is 16.30%. Comparing base (2dfe6a6) to head (3382ec8).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main   #10642   +/-   ##
=========================================
  Coverage     16.30%   16.30%           
  Complexity    13448    13448           
=========================================
  Files          5674     5674           
  Lines        499203   499203           
  Branches      60369    60369           
=========================================
+ Hits          81408    81409    +1     
+ Misses       408726   408723    -3     
- Partials       9069     9071    +2     

Flag	Coverage Δ
uitests	3.99% <ø> (ø)
unittests	17.16% <ø> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.