man: reword the descriptions of VXLAN DestinationPort= and PortRange=

The usual: "empty string" is meaningless in this context. We are not assigning
DestinationPort="". Just say "unset".

Fixes #17240.

diff --git a/man/systemd.netdev.xml b/man/systemd.netdev.xml
index 863fa9108f5bfea64922fd8430ad6ceb57fbb029..2bb99a18859cda763c5359f08f61fba60a9f15d4 100644 (file)
--- a/man/systemd.netdev.xml
+++ b/man/systemd.netdev.xml
@@ -711,20 +711,16 @@
       <varlistentry>
         <term><varname>DestinationPort=</varname></term>
         <listitem>
-          <para>Configures the default destination UDP port on a per-device basis.
-          If destination port is not specified then Linux kernel default will be used.
-          Set destination port 4789 to get the IANA assigned value. If not set or if the
-          destination port is assigned the empty string the default port of 4789 is used.</para>
+          <para>Configures the default destination UDP port. If the destination port is not specified then
+          Linux kernel default will be used. Set to 4789 to get the IANA assigned value.</para>
         </listitem>
       </varlistentry>
       <varlistentry>
         <term><varname>PortRange=</varname></term>
         <listitem>
-          <para>Configures VXLAN port range. VXLAN bases source
-          UDP port based on flow to help the receiver to be able
-          to load balance based on outer header flow. It
-          restricts the port range to the normal UDP local
-          ports, and allows overriding via configuration.</para>
+          <para>Configures the source port range for the VXLAN. The kernel assigns the source UDP port based
+          on the flow to help the receiver to do load balancing. When this option is not set, the normal
+          range of local UDP ports is used.</para>
         </listitem>
       </varlistentry>
       <varlistentry>