OpenAPI Generator Spec fails validation on divergent OpenAPI fork

[gaben98]

OpenAPI v3 has a very commonly used fork including many languages not supported by Swagger's version of OpenAPI v3. The API spec for Square fails to validate for OpenAPI Generator due to the following issues:

• attribute components.schemas.CatalogModifierOverride.CatalogModifierToggleOverrideType is not of type schema
• paths.'/v2/vendors/{vendor_id}'. Declared path parameter vendor_id needs to be defined as a path parameter in path or operation level
• attribute info.externalDocs is unexpected

These can be fixed by the following changes:

1. 
2. 
3.