services/logging: add warning about other active syslogs

This is the only information from socklog-void's INSTALL.msg that's
still missing from this page.

Since we are here, tweak language a bit.

src/config/services/logging.md

@@ -9,11 +9,12 @@ implementations available in the Void repositories.
 
 [socklog(8)](https://man.voidlinux.org/socklog.8) is a syslog implementation
 from the author of [runit(8)](https://man.voidlinux.org/runit.8). Use socklog if
-you're not sure which syslog implementation to use. To use it, install the
-`socklog-void` package, and enable the `socklog-unix` and `nanoklogd` services.
+you're not sure which syslog implementation to use. To enable it, install the
+`socklog-void` package and enable the `socklog-unix` and `nanoklogd` services.
+Ensure no other syslog daemon is running.
 
 The logs are saved in sub-directories of `/var/log/socklog/`, and `svlogtail`
-can be used to help access them conveniently.
+can be used to access them conveniently.
 
 The ability to read logs is limited to `root` and users who are part of the
 `socklog` group.