man: document that StateDirectory= trumps ProtectSystem=strict explic…

…itly

Fixes: #29798
(cherry picked from commit 04366e0)

man/systemd.exec.xml

@@ -1382,14 +1382,16 @@ CapabilityBoundingSet=~CAP_B CAP_C</programlisting>
         mounted read-only, except for the API file system subtrees <filename>/dev/</filename>,
         <filename>/proc/</filename> and <filename>/sys/</filename> (protect these directories using
         <varname>PrivateDevices=</varname>, <varname>ProtectKernelTunables=</varname>,
-        <varname>ProtectControlGroups=</varname>). This setting ensures that any modification of the vendor-supplied
-        operating system (and optionally its configuration, and local mounts) is prohibited for the service. It is
-        recommended to enable this setting for all long-running services, unless they are involved with system updates
-        or need to modify the operating system in other ways. If this option is used,
-        <varname>ReadWritePaths=</varname> may be used to exclude specific directories from being made read-only. This
-        setting is implied if <varname>DynamicUser=</varname> is set. This setting cannot ensure protection in all
-        cases. In general it has the same limitations as <varname>ReadOnlyPaths=</varname>, see below. Defaults to
-        off.</para>
+        <varname>ProtectControlGroups=</varname>). This setting ensures that any modification of the
+        vendor-supplied operating system (and optionally its configuration, and local mounts) is prohibited
+        for the service. It is recommended to enable this setting for all long-running services, unless they
+        are involved with system updates or need to modify the operating system in other ways. If this option
+        is used, <varname>ReadWritePaths=</varname> may be used to exclude specific directories from being
+        made read-only. Similar, <varname>StateDirectory=</varname>, <varname>LogsDirectory=</varname>, … and
+        related directory settings (see below) also exclude the specific directories from the effect of
+        <varname>ProtectSystem=</varname>. This setting is implied if <varname>DynamicUser=</varname> is
+        set. This setting cannot ensure protection in all cases. In general it has the same limitations as
+        <varname>ReadOnlyPaths=</varname>, see below. Defaults to off.</para>
 
         <xi:include href="version-info.xml" xpointer="v214"/></listitem>
       </varlistentry>