drm: document expectations for GETFB2 handles

There are two important details missing from the docs:

- If the memory object backing the FB already has a GEM handle,
  it's not re-used, a new one is generated.
- Aliased planes will return the same GEM handle.

v2: document how user-space can obtain DMA-BUF FDs without leaking
handles (Pekka)

Signed-off-by: Simon Ser <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Pekka Paalanen <[email protected]>
Cc: Daniel Stone <[email protected]>
Acked-by: Pekka Paalanen <[email protected]>
Reviewed-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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