man/system-or-user-ns.xml: explicitly refer to `PrivateUsers=` option

It is not clear what "unprivileged user namespaces are available" means.
It could mean either that they are only usable, that is, enabled in the kernel,
or they have been enabled for the specific service. Referring to the
`PrivateUsers=` options makes it clear that the latter is meant.

diff --git a/man/system-or-user-ns.xml b/man/system-or-user-ns.xml
index 01d1dd022ca022c6e5a2d7fb32f1484f9099d449..7a302d5980fe1be4189dd30258e0d7f95e60db96 100644 (file)
--- a/man/system-or-user-ns.xml
+++ b/man/system-or-user-ns.xml
@@ -8,9 +8,9 @@
 <refsect1>
 
 <para id="singular">This option is only available for system services, or for services running in per-user
- instances of the service manager when unprivileged user namespaces are available.</para>
+ instances of the service manager when <varname>PrivateUsers=</varname> is enabled.</para>
 
 <para id="plural">These options are only available for system services, or for services running in per-user
- instances of the service manager when unprivileged user namespaces are available.</para>
+ instances of the service manager when <varname>PrivateUsers=</varname> is enabled.</para>
 
 </refsect1>