hooklib: update documentation of changeset_obsoletedfor for changed hook type
This updates usage example of changeset_obsoleted to reflect the move from
pretxnclose to txnclose made in
04ef381000a8 (hooklib: fix detection of
successors for changeset_obsoleted).
Differential Revision: https://phab.mercurial-scm.org/D8929
#require symlink
https://bz.mercurial-scm.org/1438
$ hg init
$ ln -s foo link
$ hg add link
$ hg ci -mbad link
$ hg rm link
$ hg ci -mok
$ hg diff -g -r 0:1 > bad.patch
$ hg up 0
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg import --no-commit bad.patch
applying bad.patch
$ hg status
R link
? bad.patch