Fix dont and doesnt typos

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Fix teh typos

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Fix overriden typos

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
fix bistream typos

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>