Adding more HTTPRoute guides

[robscott]

What type of PR is this?
/kind documentation

What this PR does / why we need it:
This adds a bunch of guides for features that are not currently documented. These guides are not great, but should be better than nothing. For full disclosure - the majority of this PR was orchestrated by Gemini.

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: robscott

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [robscott]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[youngnick]

I think these are good, and can be improved over time - I'd definitely prefer to have some guides about these features rather than the nothing we currently have.

/hold
for other review
/lgtm

[rikatz]

some improvement that I would make here, but otherwise LGTM and I would leave it for a followup: I think all of our guide docs could point to the APIReference of the field.

On the bottom of the docs, we mention the other CORS options but would be cool if I could also simply click on some link that takes me to the apiref of it

That said, this can probably be a followup for this and all the other docs

[rikatz]

/lgtm
@robscott if you decide to add the APIRef on this PR, let me know, otherwise feel free to unhold and we can discuss about it later