man/io_uring_enter.2: Fix typo "which is behaves" -> "which behaves"
Just a trivial grammatical error fix.
Fixes: ("man/io_uring_enter.2: document IORING_ENTER_EXT_ARG")
Link:
@@ -70,7 +70,7 @@ the following:
.BI " const void *" arg ", size_t " argsz );
.fi
-which is behaves just like the original definition by default. However, if
+which behaves just like the original definition by default. However, if
.B IORING_ENTER_EXT_ARG
is set, then instead of a
.I sigset_t
