insmntque.9: Refer to vnode operations vector correctly

The comment in sys/vnode.h describes
the v_op member as "vnode operations vector",
so use "operations" instead of "operation" here.

Reviewed by:	bcr
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D53333

share/man/man9/insmntque.9

@@ -24,7 +24,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 .\" DAMAGE.
 .\"
-.Dd January 29, 2022
+.Dd October 24, 2025
 .Dt INSMNTQUE 9
 .Os
 .Sh NAME
@@ -56,7 +56,7 @@ The vnode must be exclusively locked.
 .Pp
 On failure,
 .Fn insmntque
-resets vnode' operation vector to the vector of
+resets vnode's operations vector to the vector of
 .Xr deadfs 9 ,
 clears
 .Va v_data ,
@@ -71,7 +71,7 @@ failure is needed, the
 function may be used instead.
 It does not do any cleanup following a failure, leaving all
 the work to the caller.
-In particular, the operation vector
+In particular, the operations vector
 .Va v_op
 and
 .Va v_data