mq: mention qqueue in module docstring

hgext/mq.py

@@ -37,6 +37,9 b" If set to 'keep', mq will obey the [diff"
 preserving existing git patches upon qrefresh. If set to 'yes' or
 'no', mq will override the [diff] section and always generate git or
 regular patches, possibly losing data in the second case.
+
+You will by default be managing a patch queue named "patches". You can
+create other, independent patch queues with the :hg:`qqueue` command.
 '''
 
 from mercurial.i18n import _

tests/test-mq.out

@@ -32,6 +32,9 b' preserving existing git patches upon qre'
 will override the [diff] section and always generate git or regular patches,
 possibly losing data in the second case.
 
+You will by default be managing a patch queue named "patches". You can create
+other, independent patch queues with the "hg qqueue" command.
+
 list of commands:
 
  qapplied     print the patches already applied