password data type redaction should not be limited to UI

[mgrafl]

The password setting of the modifier property format is described in the Data Types section as "A hint to UIs to obscure input."

OpenAPI-Specification/versions/3.1.0.md

Line 160 in ddcab42

`string` | `password` | A hint to UIs to obscure input.

Since the OpenAPI Specification is also relevant for backends, the description should be generalized, e.g., "A hint to UIs and backend systems to obscure/redact the value."

An example for the necessity of redacting the value of a password field is in the toString method generated by the openapi-generator tool: OpenAPITools/openapi-generator#16851

[MikeRalphson]

This looks like a useful improvement, thank you. Do you have time to work up a PR on the v3.1.1-dev branch?