Delete misleading text about possible purposes for authentication

[selfissued]

https://www.w3.org/TR/2024/WD-controller-document-20240817/#authentication
Delete everything starting with the comma in this sentence: "The authentication verification relationship is used to specify how the controller is expected to be authenticated, for purposes such as logging into a website or engaging in any sort of challenge-response protocol." Defining a login protocol is way out of scope here. And the second clause is also about protocols. The first part of the sentence will work fine on its own.

[msporny]

The text was put in there initially because readers wanted us to provide examples of authentication. Removing it would re-raise those concerns.

[selfissued]

It remains that the suggested uses are out of scope - especially login.

[selfissued]

My proposed wording for #61 "The processing performed following authentication is application-specific." also covers the ground that "for purposes such as logging into a website or engaging in any sort of challenge-response protocol" is trying to, but in a more general way. I suggest deleting the latter phrase and adding the former.

[msporny]

In order to make progress at W3C TPAC, I am suggesting that this issue is "editorial" and can be resolved during the Candidate Recommendation phase. The VCWG will discuss this issue at W3C TPAC to see if the "during CR" determination is correct.

[iherman]

If the choice is between, on the one hand, a spec that is succinct and with every sentence being actionable, or, on the other hand, a spec that is more readable and understandable for specification readers by way of examples, my choice goes clearly for the second. Therefore, my vote is to keep things as they are.