Configuration Validation Documentation is Outdated

[DhruvSondhi]

Describe the bug
While working on the Config Validation PR, #1554, I was constantly referring to the documentation present for the same here. Following the abstract written, I found out that the section of the documentation pertaining to the keywords & the types is invalid & redundant. The current JSON Schema implementation done in TARDIS doesn't support the types stated in that particular section. This needs to be updated & rethought upon.
The current implementation also doesn't allow for quantity object comparison (through the schema) & hence specific functions were created in the mentioned PR. allowed_value, allowed_type are not parsed correctly in the schema.