Clarify behaviour of $promise in ngResource when using an interceptor

[alexsanford]

Request Type: docs

How to reproduce:

Component(s): ngResource

Impact:

Complexity:

This issue is related to:

Detailed Description:

When an interceptor is used in ngResource, the $promise is no longer resolved with the resource object, but instead with the value returned by the interceptor. This is now specified in the docs.

Other Comments:

[mary-poppins]

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• Uses the issue template (#6753)

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[mary-poppins]

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[mary-poppins]

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[mary-poppins]

CLA signature verified! Thank you!

Someone from the team will now triage your PR and it will be processed based on the determined priority (doc updates and fixes with tests are prioritized over other changes).