Update jsonschema-core.xml

Co-authored-by: Ben Hutton <relequestual@gmail.com>

Author: gregsdennis

jsonschema-core.xml

@@ -2214,7 +2214,7 @@
 
                 <t>
                     Subschemas of these keywords evaluate the instance completely independently
-                    such that the results of one subschema MUST NOT impact the results of sibling
+                    such that the results of one such subschema MUST NOT impact the results of sibling
                     subschemas.  The consequence of this is that the subschemas may be applied in
                     any order.
                 </t>