* Official documentation on Poseidon/Firmament, a new multi-scheduler support for K8S. (#11752)
* Added documentation about Poseidon-Firmament scheduler
* Fixed some style issues.
* Udpated the document as per the review comments.
* Fixed some typos and updated the document
* Updated the document as per the review comments.
* Updated the document as per review comments. Added config details.
* Updated the document as per the latest review comments. Fixed nits
* Made changes as per latest suggestions.
* Some more changes added.
* Updated as per suggestions.
* Changed the release process section.
* SIG Docs edits
Small edits to match style guidelines.
* add plus to feature state
* capitalization
* revert feature state shortcode
since this is a Kubernetes extension, not a direct feature, it shouldn't use the regular feature state tagging.
Anvith KS