Update docs about fdisk/gdisk support for discoverable partitions

This updates the docs about using fdisk/gdisk to make partitions with the right
partition type UUID as defined in the discoverable partitions spec.

Improve wording/grammar/formatting, and reflect that gdisk supports this as
well nowadays; see https://www.rodsbooks.com/gdisk/revisions.html

docs/DISCOVERABLE_PARTITIONS.md

@@ -225,10 +225,12 @@ appliance-like installations.
 
 ### What partitioning tools will create a DPS-compliant partition table?
 
-As of util-linux 2.25.2, the fdisk tool provides type codes to create the root,
+As of util-linux 2.25.2, the `fdisk` tool provides type codes to create the
-home, and swap partitions that the DPS expects, but the gdisk tool (version
+root, home, and swap partitions that the DPS expects, By default, `fdisk` will
-0.8.10) and its variants do not support creation of a root file system with a
+create an old-style MBR, not a GPT, so typing `l` to list partition types will
-matching type code.  By default, fdisk will create an old-style MBR, not a GPT,
+not show the choices to let you set the correct UUID. Make sure to first create
-so typing 'l' to list partition types will not show the choices that the root
+an empty GPT, then type `l` in order for the DPS-compliant type codes to be
-partition with the correct UUID.  You must first create an empty GPT and then
+available.
-type 'l' in order for the DPS-compliant type codes to be available.
+
+The `gdisk` tool (from version 1.0.5 onward) and its variants (`sgdisk`,
+`cgdisk`) also support creation of partitions with a matching type code.

man/sd_bus_send.xml

@@ -84,8 +84,8 @@
     be invoked to write out any queued message data to the transport.</para>
 
     <para><function>sd_bus_message_send()</function> is the same as <function>sd_bus_send()</function> but
-    without the first and last argument. It's equivalent to
+    without the first and last argument. <function>sd_bus_message_send(m)</function> is equivalent to
-    <function>sd_bus_message_send(sd_bus_message_get_bus(m), m, NULL)</function>.</para>
+    <function>sd_bus_send(sd_bus_message_get_bus(m), m, NULL)</function>.</para>
   </refsect1>
 
   <refsect1>

man/sd_bus_set_fd.xml

@@ -98,7 +98,7 @@
         <varlistentry>
           <term><constant>-EPERM</constant></term>
 
-          <listitem><para>The bus connection has aleady been started.</para></listitem>
+          <listitem><para>The bus connection has already been started.</para></listitem>
         </varlistentry>
       </variablelist>
     </refsect2>

man/systemd.unit.xml

@@ -45,9 +45,9 @@
 <filename>/run/systemd/transient/*</filename>
 <filename>/run/systemd/generator.early/*</filename>
 <filename>/etc/systemd/system/*</filename>
-<filename>/etc/systemd/systemd.attached/*</filename>
+<filename>/etc/systemd/system.attached/*</filename>
 <filename>/run/systemd/system/*</filename>
-<filename>/run/systemd/systemd.attached/*</filename>
+<filename>/run/systemd/system.attached/*</filename>
 <filename>/run/systemd/generator/*</filename>
 <filename index='false'>…</filename>
 <filename>/usr/lib/systemd/system/*</filename>