diff docs/user-guide.rst @ 4616:a78310b900e3

docs: change `troubles` references to `instability`

Per https://www.mercurial-scm.org/wiki/CEDVocabulary.  There are a couple
instances of 'troublesome' which probably need a word, as deriviatives of
'instability' didn't really fit.  At least some of these are in the unlinked
obs-terms.rst page.

--- a/docs/user-guide.rst	Sat Apr 27 19:32:03 2019 -0400
+++ b/docs/user-guide.rst	Sat Apr 27 19:42:42 2019 -0400
@@ -352,10 +352,10 @@
 scenarios. All of these scenarios will involve *unstable* changesets,
 which is an unavoidable consequence of obsolescence. What really sets
 ``evolve`` apart from other history modification mechanisms is the
-fact that it recognizes troubles like unstable changesets and provides
+fact that it recognizes instability like unstable changesets and provides
 a consistent way for you to get back to a stable repository.
 
-(Incidentally, there are two other types of troubles that changesets
+(Incidentally, there are two other types of instability that changesets
 can get into with ``evolve``: they may be *divergent* or
 *bumped*. Both of those states are more likely to occur when
 `sharing mutable history`_, so we won't cover them in this user guide.)