Update "dependencies" CREF

We're no longer likely to drop it, but we are likely to split it.
This was successful in provoking feedback before so let's keep
it up to date.

Author: handrews

jsonschema-validation.xml

@@ -686,14 +686,14 @@
                 <section title="dependencies">
                     <t>
                         <cref>
-                            Now that "if", "then", and "else" are keywords, it is not clear whether
-                            there is any benefit in keeping the schema form of "dependencies".
-                            It is frequently misunderstood, and having a form that takes a subschema
-                            as well as a form that takes a primitive value is particularly
-                            confusing.  And it seems to be rarely used.  Depending on feedback
-                            with "if", "then", and "else", the schema form of this keyword may
-                            well be removed in a future draft.  Current thought is that the string
-                            form (giving property names in an array) is a useful shortcut.
+                            This keyword may be split into two, with the variation that uses
+                            an array of property names rather than a subschema getting a new
+                            name.  The dual behavior is confusing and relatively difficult to
+                            implement.  In the previous draft, we proposed dropping the keyword
+                            altogether, or dropping one of its forms, but we received feedback
+                            in support of keeping it.  See issues #442 and #528 at
+                            &lt;https://github.com/json-schema-org/json-schema-spec/issues&gt;
+                            for further discussion.  Further feedback is encouraged.
                         </cref>
                     </t>
                     <t>