This update the description about default priority value which is
changed in kernel.

Link: https://lore.kernel.org/all/20251011081624.224202-1-bhe@redhat.com/ (local)
Signed-off-by: Baoquan He <bhe@redhat.com>
Cc: chrisl@kernel.org
Cc: baohua@kernel.org
Cc: alx@kernel.org
---
 man/man2/swapon.2 | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/man/man2/swapon.2 b/man/man2/swapon.2
index df5e8d8c7ec6..20e213827733 100644
--- a/man/man2/swapon.2
+++ b/man/man2/swapon.2

@@ -60,9 +60,8 @@ These functions may be used only by a privileged process (one having the
 capability).
 .SS Priority
 Each swap area has a priority, either high or low.
-The default priority is low.
-Within the low-priority areas,
-newer areas are even lower priority than older areas.
+The default priority is the lowest,
+and all default areas share the same priority value, -1.