[PATCH 1 of 2] bookmarks: rephrase a comment to be shorted and clearer

[Pierre-Yves David]

# HG changeset patch
# User Pierre-Yves David <pierre-yves.david at octobus.net>
# Date 1497056101 -3600
#      Sat Jun 10 01:55:01 2017 +0100
# Node ID 10c0e1f7d48bfa560879bbdbc6ceedc266e1b38b
# Parent  776d077eb4ef815e08631fb1e7b33375adca3ef1
# EXP-Topic bookmark
# Available At https://www.mercurial-scm.org/repo/users/marmoute/mercurial/
#              hg pull https://www.mercurial-scm.org/repo/users/marmoute/mercurial/ -r 10c0e1f7d48b
bookmarks: rephrase a comment to be shorted and clearer

The initial motivation is that I need an initial level of indent in the next
changeset o:-) It turn out I like the new version better.

diff --git a/mercurial/bookmarks.py b/mercurial/bookmarks.py
--- a/mercurial/bookmarks.py
+++ b/mercurial/bookmarks.py
@@ -68,9 +68,11 @@ class bmstore(dict):
                         refspec = encoding.tolocal(refspec)
                         setitem(self, refspec, node)
                 except (TypeError, ValueError):
-                    # - bin(...) can raise TypeError
-                    # - node in nm can raise ValueError for non-20-bytes entry
-                    # - split(...) can raise ValueError for string without ' '
+                    # TypeError:
+                    # - bin(...)
+                    # ValueError:
+                    # - node in nm, for non-20-bytes entry
+                    # - split(...), for string without ' '
                     repo.ui.warn(_('malformed line in .hg/bookmarks: %r\n')
                                  % line)
         except IOError as inst: