drm/simple-kms: Fix documentation for drm_simple_encoder_init()

Brings the documentation of drm_simple_encoder_init() in sync with the
function's signature. Also add a paragraph clarifying the management of
the encoder's memory.

v2:
	* document memory management

Signed-off-by: Thomas Zimmermann <[email protected]>
Reviewed-by: Daniel Vetter <[email protected]>
Fixes: 63170ac6f2e8 ("drm/simple-kms: Add drm_simple_encoder_{init,create}()")
Cc: Sam Ravnborg <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: [email protected]
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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