histedit: remove updating statistics line from the examples describing rules

Before this patch, updating statistics line appears at the bottom of
the examples describing rules to edit history.

But such line never appear in the file describing rules while
histedit-ing, so this patch removes that line from the examples.

hgext/histedit.py

@@ -37,7 +37,6 b' file open in your editor::'
  #  d, drop = remove commit from history
  #  m, mess = edit message without changing commit content
  #
- 0 files updated, 0 files merged, 0 files removed, 0 files unresolved
 
 In this file, lines beginning with ``#`` are ignored. You must specify a rule
 for each revision in your history. For example, if you had meant to add gamma
@@ -57,7 +56,6 b' would reorganize the file to look like t'
  #  d, drop = remove commit from history
  #  m, mess = edit message without changing commit content
  #
- 0 files updated, 0 files merged, 0 files removed, 0 files unresolved
 
 At which point you close the editor and ``histedit`` starts working. When you
 specify a ``fold`` operation, ``histedit`` will open an editor when it folds