numa: fix missing '-numa cpu' in '-help' output

commit 419fcdec (numa: add '-numa cpu,...' option for property based node mapping)
added '-numa cpu' option but forgot to update appropriate section for '--help'.
Add '-numa cpu' description to '-help' output
Reported-by: NMarkus Armbruster <armbru@redhat.com>
Signed-off-by: NIgor Mammedov <imammedo@redhat.com>
Message-Id: <1511880838-56509-1-git-send-email-imammedo@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Signed-off-by: NEduardo Habkost <ehabkost@redhat.com>

qemu-options.hx

@@ -169,7 +169,9 @@ ETEXI
 DEF("numa", HAS_ARG, QEMU_OPTION_numa,
     "-numa node[,mem=size][,cpus=firstcpu[-lastcpu]][,nodeid=node]\n"
     "-numa node[,memdev=id][,cpus=firstcpu[-lastcpu]][,nodeid=node]\n"
-    "-numa dist,src=source,dst=destination,val=distance\n", QEMU_ARCH_ALL)
+    "-numa dist,src=source,dst=destination,val=distance\n"
+    "-numa cpu,node-id=node[,socket-id=x][,core-id=y][,thread-id=z]\n",
+    QEMU_ARCH_ALL)
 STEXI
 @item -numa node[,mem=@var{size}][,cpus=@var{firstcpu}[-@var{lastcpu}]][,nodeid=@var{node}]
 @itemx -numa node[,memdev=@var{id}][,cpus=@var{firstcpu}[-@var{lastcpu}]][,nodeid=@var{node}]