updating docs with more information about rsc <> non rsc custom Components

[nautsimon]

I banged my head on this for a bit and thought this could help make docs better since its not super obvious that rsc and non rsc have different api.

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[hashicorp-cla-app]

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[nautsimon]

also suggestions to better incorporate this info is appreciated :)

Also I can make a PR to unify the API for the rsc/non rsc

[nautsimon]

@cjalvis
@dstaley

[nautsimon]

bump
@cjalvis
@dstaley

[nautsimon]

@cjalvis need a authorized member to merge :)