Add missing documentation for modules in FsToolkit.ErrorHandling namespace

[tw0po1nt]

Proposed Changes

Add missing documentation for the modules under FsToolkit.ErrorHandling namespace

Types of changes

• Bugfix (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 not work as expected)
• Add documentation

Checklist

• Build and tests pass locally
• I have added tests that prove my fix is effective or that my feature works (if appropriate)
• I have added necessary documentation (if appropriate)

[tw0po1nt]

Completed self-review

[TheAngryByrd]

❤️ Thank you for all this!