it is no longer the evaluator's responsibility to combine annotations

similar changes were made in #787.

Author: karenetheridge

jsonschema-core.xml

@@ -2368,10 +2368,7 @@
                         </t>
                         <t>
                             The annotation result of this keyword is the set of instance
-                            property names matched by this keyword.  Annotation results
-                            for "properties" keywords from multiple schemas applied to
-                            the same instance location are combined by taking the union
-                            of the sets.
+                            property names matched by this keyword.
                         </t>
                         <t>
                             Omitting this keyword has the same assertion behavior as
@@ -2394,10 +2391,7 @@
                         </t>
                         <t>
                             The annotation result of this keyword is the set of instance
-                            property names matched by this keyword.  Annotation results
-                            for "patternProperties" keywords from multiple schemas applied to
-                            the same instance location are combined by taking the union
-                            of the sets.
+                            property names matched by this keyword.
                         </t>
                         <t>
                             Omitting this keyword has the same assertion behavior as
@@ -2424,9 +2418,6 @@
                         <t>
                             The annotation result of this keyword is the set of instance
                             property names validated by this keyword's subschema.
-                            Annotation results for "additionalProperties" keywords from
-                            multiple schemas applied to the same instance location are combined
-                            by taking the union of the sets.
                         </t>
                         <t>
                             Omitting this keyword has the same assertion behavior as
@@ -2607,9 +2598,6 @@
                 <t>
                     The annotation result of this keyword is the set of instance
                     property names validated by this keyword's subschema.
-                    Annotation results for "unevaluatedProperties" keywords from
-                    multiple schemas applied to the same instance location are combined
-                    by taking the union of the sets.
                 </t>
                 <t>
                     Omitting this keyword has the same assertion behavior as