Category Clean-up: Parsers, Schema Validators, Validator

[dret]

Looking at the page I see categories for "Parsers, Schema Validators, Validator" and at least the lonely "Validator" looks like it should be a "Schema Validator". I am wondering about the difference between Parsers and Schema Validators. And I am also wondering how tooling for linting and diffing would fit into that.

Maybe it would be helpful to add a brief description to each category?

[spacether]

Validator may be an openapi document validator, not a a component schema validator