Fix up test-help for export

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Fix up test-help for export

manifest hash: a178ced2f645770d11c88261489dd8e8d876d94c
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tests/test-help.out

@@ -1,88 +1,88
 + hg -q help
 hg commands:
 
  add         add the specified files on the next commit
  addremove   add all new files, delete all missing files
  annotate    show changeset information per file line
  cat         output the latest or given revision of a file
  clone       make a copy of an existing repository
  commit      commit the specified files or all outstanding changes
  copy        mark a file as copied or renamed for the next commit
  diff        diff working directory (or selected files)
- export      dump the changeset header and diffs for a revision
+ export      dump the header and diffs for one or more changesets
  forget      don't add the specified files on the next commit
  heads       show current repository heads
  help        show help for a given command or all commands
  identify    print information about the working copy
  import      import an ordered set of patches
  init        create a new repository in the current directory
  log         show the revision history of the repository or a single file
  manifest    output the latest or given revision of the project manifest
  parents     show the parents of the current working dir
  pull        pull changes from the specified source
  push        push changes to the specified destination
  rawcommit   raw commit interface
  recover     roll back an interrupted transaction
  remove      remove the specified files on the next commit
  root        print the root (top) of the current working dir
  serve       export the repository via HTTP
  status      show changed files in the working directory
  tag         add a tag for the current tip or a given revision
  tags        list repository tags
  tip         show the tip revision
  undo        undo the last transaction
  update      update or merge working directory
  verify      verify the integrity of the repository
  version     output version and copyright information
 + hg add -h
 hg add: option -h not recognized
 hg add [files]
 
 add the specified files on the next commit
 + hg help diff
 hg diff [-r A] [-r B] [files]
 
  -r --rev 
    revision
 
 diff working directory (or selected files)
 + hg help foo
 hg: unknown command foo
 + hg -q commands
 hg: unknown command 'commands'
 hg commands:
 
  add         add the specified files on the next commit
  addremove   add all new files, delete all missing files
  annotate    show changeset information per file line
  cat         output the latest or given revision of a file
  clone       make a copy of an existing repository
  commit      commit the specified files or all outstanding changes
  copy        mark a file as copied or renamed for the next commit
  diff        diff working directory (or selected files)
- export      dump the changeset header and diffs for a revision
+ export      dump the header and diffs for one or more changesets
  forget      don't add the specified files on the next commit
  heads       show current repository heads
  help        show help for a given command or all commands
  identify    print information about the working copy
  import      import an ordered set of patches
  init        create a new repository in the current directory
  log         show the revision history of the repository or a single file
  manifest    output the latest or given revision of the project manifest
  parents     show the parents of the current working dir
  pull        pull changes from the specified source
  push        push changes to the specified destination
  rawcommit   raw commit interface
  recover     roll back an interrupted transaction
  remove      remove the specified files on the next commit
  root        print the root (top) of the current working dir
  serve       export the repository via HTTP
  status      show changed files in the working directory
  tag         add a tag for the current tip or a given revision
  tags        list repository tags
  tip         show the tip revision
  undo        undo the last transaction
  update      update or merge working directory
  verify      verify the integrity of the repository
  version     output version and copyright information
 + exit 0