hv: Synthetic typo correction

Just a trivial tyop fix.
Signed-off-by: NJoe Perches <joe@perches.com>
Signed-off-by: NK. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/hv/hv.c

@@ -217,7 +217,7 @@ void hv_synic_free(void)
 }
 
 /*
- * hv_synic_init - Initialize the Synthethic Interrupt Controller.
+ * hv_synic_init - Initialize the Synthetic Interrupt Controller.
  *
  * If it is already initialized by another entity (ie x2v shim), we need to
  * retrieve the initialized message and event pages.  Otherwise, we create and