Performed changes according to feedback on Azure/azure-rest-api-specs/pull/1833

[stevengum]

Changes to LUIS Endpoint API.swagger.json

In reference to review from veronicagg.

• Added periods to descriptions
• Changed operationId names for both Programmatic and Endpoint Swagger Files
• (Endpoint) Added additional definitions for results object from LUIS (required for next item)
• Added response schemas to operations. Without schemas autorest does not properly handle 20X responses.
• (Programmatic) Added additional definitions for results objects from LUIS (required for next item)
• Added response schemas to operations. Without schemas autorest does not properly handle 20X responses.
• Created globally defined parameters where applicable in both Programmatic and Endpoint Swagger Files
• Default/Error Response implemented in Programmatic Swagger file
• Default/Error Response implemented in Endpoint Swagger file

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I performed some of the changes outlined in the original PR against azure-rest-api-specs and generated a working SDK using autorest before submitting this PR.

[v-geberr]

Ignore this comment

[stevengum]

Closing PR after handing off completed work to Southworks.

See PRs 2083 and 2051 against the Azure/azure-rest-api-specs repo.