x86: kvm_para: fix typo in hypercall comments

Correct a typo in the comment explaining hypercalls.
Signed-off-by: Jesse Larrew <jlarrew@linux.vnet.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

arch/x86/include/asm/kvm_para.h

@@ -122,7 +122,7 @@ static inline bool kvm_check_and_clear_guest_paused(void)
  *
  * Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively.
  * The hypercall number should be placed in rax and the return value will be
- * placed in rax.  No other registers will be clobbered unless explicited
+ * placed in rax.  No other registers will be clobbered unless explicitly
  * noted by the particular hypercall.
  */