virsh: Fix help message of allocpages

Fix info in the command definition of allocpages, which is currently
pointing info for 'capabilities'.
Signed-off-by: NTomoki Sekiyama <tomoki.sekiyama@hds.com>

tools/virsh-host.c

@@ -1326,7 +1326,7 @@ const vshCmdDef hostAndHypervisorCmds[] = {
     {.name = "allocpages",
      .handler = cmdAllocpages,
      .opts = opts_allocpages,
-     .info = info_capabilities,
+     .info = info_allocpages,
      .flags = 0
     },
     {.name = "capabilities",