Documentation: virtual: fix spelling mistake

Signed-off-by: Eric Engestrom <[e-mail]>
Acked-by: Cornelia Huck <[e-mail]>
Signed-off-by: Radim Krčmář <[e-mail]>

Documentation/virtual/kvm/devices/s390_flic.txt

···
 
   KVM_DEV_FLIC_ADAPTER_MODIFY
     Modifies attributes of an existing I/O adapter interrupt source. Takes
-    a kvm_s390_io_adapter_req specifiying the adapter and the operation:
+    a kvm_s390_io_adapter_req specifying the adapter and the operation:
 
 struct kvm_s390_io_adapter_req {
 	__u32 id;