Fix the missing example in HTTP rewrite

[spacewander]

Also give them clearer names. Signed-off-by: spacewander spacewanderlzx@gmail.com

What type of PR is this?

/kind documentation

What this PR does / why we need it:

There is expected to be one more example in the rewrite section.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

Hi @spacewander. Thanks for your PR.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: robscott, spacewander

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[spacewander]

@robscott Would you review this PR again? Thanks!

[robscott]

Thanks @spacewander! Sorry I'd lost track of this one!

/lgtm