common/vty.c: fix 'cfg_phy_no_inst_cmd' command description

A comma is needed to separate a command definition from its
description, not the parts of description. Let's fix this.

Before this patch:

  OsmoBTS# configure terminal
  OsmoBTS(config)# phy 0
  OsmoBTS(phy)# no?

    no  PHY Instance number

  OsmoBTS(phy)# no ?

    instance
    osmotrx   OsmoTRX Transceiver configuration

After this patch:

  OsmoBTS# configure terminal
  OsmoBTS(config)# phy 0
  OsmoBTS(phy)# no?

    no  Negate a command or set its defaults

  OsmoBTS(phy)# no ?

    instance  Select a PHY instance to remove
    osmotrx   OsmoTRX Transceiver configuration

Change-Id: If10d85abc6506118ba08c37e8101f423d6f838ea

src/common/vty.c

@@ -1463,8 +1463,8 @@ DEFUN(cfg_phy_inst, cfg_phy_inst_cmd,
 }
 
 DEFUN(cfg_phy_no_inst, cfg_phy_no_inst_cmd,
-	"no instance <0-255>"
-	NO_STR "Select a PHY instance to remove\n", "PHY Instance number\n")
+	"no instance <0-255>",
+	NO_STR "Select a PHY instance to remove\n" "PHY Instance number\n")
 {
 	int inst_nr = atoi(argv[0]);
 	struct phy_link *plink = vty->index;