docs: notify example was moved to sd_notify manpage

Reference in the portability doc was forgot

Follow-up for 383917ac67570e2dccd558bcde3910a686b9f077

diff --git a/docs/PORTABILITY_AND_STABILITY.md b/docs/PORTABILITY_AND_STABILITY.md
index fda42c84c056fc2ab49de0b8f6c367817a3a543b..db94c976a75545cfd8a3d6dba899a6327fadbbe1 100644 (file)
--- a/docs/PORTABILITY_AND_STABILITY.md
+++ b/docs/PORTABILITY_AND_STABILITY.md
@@ -19,7 +19,7 @@ The stable interfaces are:
   [sd_notify(3)](https://www.freedesktop.org/software/systemd/man/sd_notify.html). Note that, although using
   libsystemd is a good choice, this protocol can also be reimplemented without external dependencies, as
   demonstrated in the example listed in
-  [systemd.service(5)](https://www.freedesktop.org/software/systemd/man/systemd.service.html)
+  [sd_notify(3)](https://www.freedesktop.org/software/systemd/man/devel/sd_notify.html#Notes)
 
 * Some of the **"special" unit names** and their semantics. To be precise the ones that are necessary for normal services, and not those required only for early boot and late shutdown, with very few exceptions. To list them here: `basic.target`, `shutdown.target`, `sockets.target`, `network.target`, `getty.target`, `graphical.target`, `multi-user.target`, `rescue.target`, `emergency.target`, `poweroff.target`, `reboot.target`, `halt.target`, `runlevel[1-5].target`.