media: vidioc-g-parm.rst: update the VIDIOC_G/S_PARM documentation

This documentation is very outdated. In particular, it is
not obvious at all that this is used to change the framerate of
sensors.

Fix it, and include references to the stateful encoder API where
this works slightly different.

Signed-off-by: Hans Verkuil <[email protected]>
Acked-by: Tomasz Figa <[email protected]>
Reviewed-by: Michael Tretter <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>

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