media: drivers/media/pci/bt8xx/bttv-cards: fix typos

change 'vodeo'     to 'video'
change 'nevery'    to 'never'
change 'is'        to 'it'
change 'connevted' to 'connected'
change 'swichers'  to 'switchers'
change 'strucure'  to 'structure'
change 'unblanced' to 'unbalanced'
change 'fonctionality' to 'functionality'

Signed-off-by: Xiaofeng Cao <caoxiaofeng@yulong.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>