fix test-help diff options.

tests/test-help.out

@@ -174,6 +174,8 b' options:'
  -r --rev      revision
  -a --text     treat all files as text
  -I --include  include names matching the given patterns
+ -p --show-function     show which function each change is in
+ -w --ignore-all-space  ignore white space when comparing lines
  -X --exclude  exclude names matching the given patterns
 hg status [OPTION]... [FILE]...