[1010] Remove duplicate words

Author: ssilverman

jsonschema-core.xml

@@ -549,8 +549,8 @@
                 </t>
                 <t>
                     Regular expressions SHOULD be built with the "u" flag (or equivilent) to provide
-                    Unicode support, or processed in such a way which provides which provides Unicode
-                    as defined by ECMA-262.
+                    Unicode support, or processed in such a way which provides Unicode as defined
+                    by ECMA-262.
                 </t>
                 <t>
                     Furthermore, given the high disparity in regular expression constructs support,