man,units: drop "temporary" from description of systemd-tmpfiles

Historically, systemd-tmpfiles was designed to manager temporary
files, but nowadays it has become a generic tool for managing
all kinds of files. To avoid user confusion, let's remove "temporary"
from the tool's description.

As discussed in #33349

(cherry picked from commit b5c8cc0)
(cherry picked from commit 1a0e696)
(cherry picked from commit c752efd)
(cherry picked from commit 269fb21)
(cherry picked from commit dea4c37)

Author: YHNdnzj

man/systemd-tmpfiles.xml

@@ -48,8 +48,8 @@
   <refsect1>
     <title>Description</title>
 
-    <para><command>systemd-tmpfiles</command> creates, deletes, and cleans up volatile and temporary files
-    and directories, using the configuration file format and location specified in
+    <para><command>systemd-tmpfiles</command> creates, deletes, and cleans up files and directories, using
+    the configuration file format and location specified in
     <citerefentry><refentrytitle>tmpfiles.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>. It must
     be invoked with one or more options <option>--create</option>, <option>--remove</option>, and
     <option>--clean</option>, to select the respective subset of operations.</para>

units/systemd-tmpfiles-setup.service

@@ -8,7 +8,7 @@
 #  (at your option) any later version.
 
 [Unit]
-Description=Create Volatile Files and Directories
+Description=Create System Files and Directories
 Documentation=man:tmpfiles.d(5) man:systemd-tmpfiles(8)
 
 DefaultDependencies=no

units/user/systemd-tmpfiles-setup.service

@@ -8,7 +8,7 @@
 #  (at your option) any later version.
 
 [Unit]
-Description=Create User's Volatile Files and Directories
+Description=Create User Files and Directories
 Documentation=man:tmpfiles.d(5) man:systemd-tmpfiles(8)
 DefaultDependencies=no
 Conflicts=shutdown.target