copies: fix some comment in _filter
The scenario the comment describes match case 6, not case 2.
Differential Revision: https://phab.mercurial-scm.org/D9793
--- a/mercurial/copies.py Sat Jan 16 00:54:33 2021 +0100
+++ b/mercurial/copies.py Fri Jan 15 23:47:16 2021 +0100
@@ -41,7 +41,7 @@
# When _chain()'ing copies in 'a' (from 'src' via some other commit 'mid')
# with copies in 'b' (from 'mid' to 'dst'), we can get the different cases
- # in the following table (not including trivial cases). For example, case 2
+ # in the following table (not including trivial cases). For example, case 6
# is where a file existed in 'src' and remained under that name in 'mid' and
# then was renamed between 'mid' and 'dst'.
#