Update jsonschema-core.xml

Fix typo

Co-authored-by: Karen Etheridge <ether@cpan.org>

Author: Relequestual

jsonschema-core.xml

@@ -1863,7 +1863,7 @@
                         dialects, it is NOT RECOMMENDED that these documents are validated by applying a meta-schema
                         to the Compound Schema Document as an instance. It is RECOMMENDED that an alternate
                         validation process be provided in order to validate Compound Schema Documents
-                        (such as a differnet function).
+                        (such as a different function).
                     </t>
                     <t>
                         A Compound Schema Document in which all embedded resources idenfity as using the same