Chang "all of" to "any of" to make the use of instance media type param schema consistent with section 13.1 and 13.12

Fixes json-schema-org#832

Author: Relequestual

jsonschema-core.xml

@@ -2958,7 +2958,7 @@ Content-Type: application/schema-instance+json;
 
                 <t>
                     Multiple schemas are whitespace separated, and indicate that the
-                    instance conforms to all of the listed schemas:
+                    instance conforms to any of the listed schemas:
                 </t>
 
                 <figure>
@@ -2987,7 +2987,7 @@ Accept: application/schema-instance+json;
 
                 <t>
                     As with Content-Type, multiple schema parameters in the same string
-                    requests an instance that conforms to all of the listed schemas.
+                    requests an instance that conforms to any of the listed schemas.
                 </t>
 
                 <t>