net: Drop the legacy "name" parameter from the -net option

It's been deprecated since QEMU v3.1, so it's time to finally
remove it. The "id" parameter can simply be used instead.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

docs/system/deprecated.rst

@@ -47,12 +47,6 @@ The 'file' driver for drives is no longer appropriate for character or host
 devices and will only accept regular files (S_IFREG). The correct driver
 for these file types is 'host_cdrom' or 'host_device' as appropriate.
 
-``-net ...,name=``\ *name* (since 3.1)
-''''''''''''''''''''''''''''''''''''''
-
-The ``name`` parameter of the ``-net`` option is a synonym
-for the ``id`` parameter, which should now be used instead.
-
 ``-smp`` (invalid topologies) (since 3.1)
 '''''''''''''''''''''''''''''''''''''''''
 
@@ -441,6 +435,15 @@ What follows is a record of recently removed, formerly deprecated
 features that serves as a record for users who have encountered
 trouble after a recent upgrade.
 
+System emulator command line arguments
+--------------------------------------
+
+``-net ...,name=``\ *name* (removed in 5.1)
+'''''''''''''''''''''''''''''''''''''''''''
+
+The ``name`` parameter of the ``-net`` option was a synonym
+for the ``id`` parameter, which should now be used instead.
+
 QEMU Machine Protocol (QMP) commands
 ------------------------------------