mq: fix secret description in help

hgext/mq.py

@@ -38,7 +38,7 b' preserving existing git patches upon qre'
 'no', mq will override the [diff] section and always generate git or
 regular patches, possibly losing data in the second case.
 
-It may be desirable for mq changesets in the secret phase (see
+It may be desirable for mq changesets to be kept in the secret phase (see
 :hg:`help phases`), which can be enabled with the following setting::
 
   [mq]

tests/test-mq.t

@@ -50,8 +50,8 b' help'
   will override the [diff] section and always generate git or regular patches,
   possibly losing data in the second case.
   
-  It may be desirable for mq changesets in the secret phase (see "hg help
-  phases"), which can be enabled with the following setting:
+  It may be desirable for mq changesets to be kept in the secret phase (see "hg
+  help phases"), which can be enabled with the following setting:
   
     [mq]
     secret = True