libcamera: Fix spellings and grammar

Fix a number of spelling errors and word duplications throughout the comments
within libcamera.

These were picked up with spellintian.

Also one capitalisation of the first word of a \return statement picked
up by checkstyle.py while creating this patch.

Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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