rewriteutil: add pointer to help text when rewrite would cause divergence

The evolve extension's version of the hint has this pointer. I missed
it when I moved it to core.

Differential Revision: https://phab.mercurial-scm.org/D10723

mercurial/rewriteutil.py

@@ -114,7 +114,11 b" def precheck(repo, revs, action=b'rewrit"
                 raise error.InputError(msg)
             else:
                 raise error.InputError(
-                    msg, hint=_(b"add --verbose for details")
+                    msg,
+                    hint=_(
+                        b"add --verbose for details or see "
+                        b"'hg help evolution.instability'"
+                    ),
                 )
 
 

tests/test-amend.t

@@ -239,7 +239,7 b' Cannot cause divergence by default'
   1 files updated, 0 files merged, 1 files removed, 0 files unresolved
   $ hg amend -m divergent
   abort: cannot amend 112478962961, as that creates content-divergence with 16084da537dd
-  (add --verbose for details)
+  (add --verbose for details or see 'hg help evolution.instability')
   [10]
   $ hg amend -m divergent --config experimental.evolution.allowdivergence=true
   2 new content-divergent changesets

tests/test-branch-change.t

@@ -151,7 +151,7 b' Changing branch of an obsoleted changese'
 
   $ hg branch -r 4 --hidden foobar
   abort: cannot change branch of 3938acfb5c0f, as that creates content-divergence with 7c1991464886
-  (add --verbose for details)
+  (add --verbose for details or see 'hg help evolution.instability')
   [10]
 
 Make sure bookmark movement is correct