staging: most: video: Fixed minor capitalization and grammatical issues

staging: most: video: Fixed minor capitalization and grammatical issues

This patch makes three error messages in the driver easier to read by
capitalizing the first letters properly.
For example, "channel already linked" becomes "Channel already linked", and
"expect" becomes "expected", as you would typically
find in an error message.
This patch improves user experience by making the errors clearer.

Signed-off-by: Steven Davis <goldside000@outlook.com>
Link: https://lore.kernel.org/r/SJ2P223MB1026E786B28986901BC1C126F7A92@SJ2P223MB1026.NAMP223.PROD.OUTLOOK.COM
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>