Add user documentation for KEP-2937 to website

[dgrove-oss]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Adds user-facing documentation on configurable resource transformations (KEP-2937) to website

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

I'm putting NONE for the release note, because #3026 which is the implementation PR contains the release note text.

Written under the assumption that we'll be merge 3026 in time to make 0.9.

Does this PR introduce a user-facing change?

NONE

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[k8s-ci-robot]

Hi @dgrove-oss. Thanks for your PR.

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[mbobrovskyi]

/ok-to-test

[kannon92]

Waiting on #3026.

/hold

Doc looks good to me though.

[tenzen-y]

/cc

[mimowo]

/hold cancel
the impl is merged

[mimowo]

Please also explain the role of the WorkloadResourceRequestsSummary, and I would suggest it as a recommendation to provide visibility into the summary of the resources.

[dgrove-oss]

I expanded the example of troubleshooting a pending Job to show resourceRequests.

I thought about showing two yaml blocks; one with the feature enabled and one without (ie, what was there before), but it seemed like overkill. I could easily change it if that is preferred though.