Fix key capability post, patch, response

[tbedford]

Description

When testing key creation it was noticed there was an error. This was due to an incorrect OAS3 spec being imported to Postman - the capablity arrangement for keys had been changed at some point and this was not reflected in this spec. This PR fixes the capability in the key_response, and also the request body sections for both key_post and key_patch.

• JIRA ticket

Checklist for OpenAPI document updates

Please ensure the following:

• Version has been incremented
• Tested for errors with Spectral
• Optional: Load into SwaggerHub and check for errors
• Ensure the document renders under ReDoc (see README for instructions on how to test locally)

Review

• For this PR the best way is to check the diff.
• Also check that the key section of the docs renders correctly locally.

[m-hulbert]

Tested locally and renders correctly. Just 2 minor comments/suggestions.

[m-hulbert]

Re-tested and LGTM

[tbedford]

We'll circle back and take another look at the default property name issue.

Redocly/redoc#622

There's a vendor-specific override that may help.