docs: fixes grammar and spelling in Markdown files only

[jbampton]

Description

This PR fixes mainly spelling in Markdown docs files only.

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?

Markdown changes only. Some good clean ups. Hoping to get merged quicker than usual.

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 17.16%. Comparing base (0934fb1) to head (cbbd9b2).
Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #10656      +/-   ##
============================================
+ Coverage     16.30%   17.16%   +0.85%     
+ Complexity    13450    13448       -2     
============================================
  Files          5675     5277     -398     
  Lines        499249   466660   -32589     
  Branches      60377    54596    -5781     
============================================
- Hits          81425    80114    -1311     
+ Misses       408753   377622   -31131     
+ Partials       9071     8924     -147     

Flag	Coverage Δ
uitests	?
unittests	17.16% <ø> (-0.01%)	⬇️

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[bernardodemarco]

only typo/grammar fixes, lgtm