hv: hyperv.h: a few mundane typo fixes

s/sructure/structure/
s/extention/extension/
s/offerred/offered/
s/adversley/adversely/

Signed-off-by: Bhaskar Chowdhury <unixbhaskar@gmail.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20210321233108.3885240-1-unixbhaskar@gmail.com


Signed-off-by: Wei Liu <wei.liu@kernel.org>