doc: fix command in amqp-consume doc

Fixes: alanxz#791

Author: alanxz

tools/doc/amqp-consume.xml

@@ -194,7 +194,7 @@
  output the message bodies on standard output via
  <command>cat</command>:</term>
  <listitem>
- <screen><prompt>$ </prompt><userinput>amqp-publish -q myqueue cat</userinput></screen>
+ <screen><prompt>$ </prompt><userinput>amqp-consume -q myqueue cat</userinput></screen>
  </listitem>
  </varlistentry>