docs: fixing badges and other small issues

[manchuck]

Description

Motivation and Context

Testing Details

Example Output or Screenshots (if appropriate)

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)

Checklist

• [ ] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

[codecov-commenter]

Codecov Report

Merging #817 (60211e6) into 3.x (f10f9e4) will increase coverage by 1.44%. The diff coverage is n/a.

@@            Coverage Diff             @@
##              3.x     #817      +/-   ##
==========================================
+ Coverage   77.49%   78.94%   +1.44%     
==========================================
  Files          86      104      +18     
  Lines        1133     1211      +78     
  Branches      233      234       +1     
==========================================
+ Hits          878      956      +78     
  Misses        255      255              

see 20 files with indirect coverage changes

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