Fixed typo

/theses/these/

Author: Relequestual

jsonschema-core.xml

@@ -1509,7 +1509,7 @@
                             resolution is needed.
                         </t>
                         <t>
-                            For a full example using theses keyword, see appendix
+                            For a full example using these keyword, see appendix
                             <xref target="recursive-example" format="counter" />.
                             <cref>
                                 The difference between the hyper-schema meta-schema in pre-2019