Clarify constraints overhaul in user guide

Co-authored-by: Paul Moore <p.f.moore@gmail.com>
pypa · Oct 27, 2020 · 83ae8d2 · 83ae8d2
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diff --git a/docs/html/user_guide.rst b/docs/html/user_guide.rst
@@ -290,9 +290,10 @@ organisation and use that everywhere. If the thing being installed requires
 file will be used.
 
 Constraints file support was added in pip 7.1. In :ref:`Resolver
-changes 2020` we did a fairly comprehensive overhaul and stripped
-constraints files down to being purely a way to specify global
-(version) limits for packages.
+changes 2020` we did a fairly comprehensive overhaul, removing several
+undocumented and unsupported quirks from the previous implementation,
+and stripped constraints files down to being purely a way to specify
+global (version) limits for packages.
 
 .. _`Installing from Wheels`: