man: adjust description of PrivateUsers= so it is in line with reality

When the option is not available unit will not even start so there is
no security risk.

Fixes #34983

diff --git a/man/systemd.exec.xml b/man/systemd.exec.xml
index b1fcfecd74fc355ef351b5dbcbf0d9f8e4b4bc45..695049db97592cdffea8476f84601c080c7d357f 100644 (file)
--- a/man/systemd.exec.xml
+++ b/man/systemd.exec.xml
@@ -2053,10 +2053,6 @@ BindReadOnlyPaths=/var/lib/systemd</programlisting>
         databases in the root directory and on the host is reduced, as the only users and groups who need to be matched
         are <literal>root</literal>, <literal>nobody</literal> and the unit's own user and group.</para>
 
-        <para>Note that the implementation of this setting might be impossible (for example if user namespaces are not
-        available), and the unit should be written in a way that does not solely rely on this setting for
-        security.</para>
-
         <xi:include href="version-info.xml" xpointer="v232"/></listitem>
       </varlistentry>