staging: hv: Corrected all header comment formats kernel-doc format

Removed kerneldoc /** from functions that should not have them.
Added proper kerneldoc headers to functions that should have them.

This includes fixes as pointed out by Randy Dunlap and Joe Perches.

Cc: Joe Perches <joe@perches.com>
Acked-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>