review/update SIG-Scheduling devel docs

[sanposhiho]

Describe the issue

We haven't paid enough attention to those docs. We should review and update some pages.
I haven't gone through all though, for example, QHint needs to be mentioned at this page etc.

https://github.com/kubernetes/community/tree/master/contributors/devel/sig-scheduling

/cc @kubernetes/sig-scheduling-misc @dom4ha @macsko @AxeZhan

[sanposhiho]

/sig scheduling
/kind documentation

[macsko]

/assign
I'll update the scheduler benchmarking doc.

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/lifecycle stale

[sanposhiho]

/remove-lifecycle stale