bookflow: fix bullet list indentation in docstring

hgext/bookflow.py

@@ -1,12 +1,12 b''
 """implements bookmark-based branching (EXPERIMENTAL)
 
- - Disables creation of new branches (config: enable_branches=False).
- - Requires an active bookmark on commit (config: require_bookmark=True).
- - Doesn't move the active bookmark on update, only on commit.
- - Requires '--rev' for moving an existing bookmark.
- - Protects special bookmarks (config: protect=@).
+- Disables creation of new branches (config: enable_branches=False).
+- Requires an active bookmark on commit (config: require_bookmark=True).
+- Doesn't move the active bookmark on update, only on commit.
+- Requires '--rev' for moving an existing bookmark.
+- Protects special bookmarks (config: protect=@).
 
- flow related commands
+flow related commands
 
     :hg book NAME: create a new bookmark
     :hg book NAME -r REV: move bookmark to revision (fast-forward)