Fix typo!

Author: Relequestual

jsonschema-validation.xml

@@ -1044,7 +1044,7 @@
                 </t>
                 <t>
                     A root schema containing "deprecated" with a value of true indicates that
-                    the entire resource beng described MAY be removed in the future.
+                    the entire resource being described MAY be removed in the future.
                 </t>
                 <t>
                     When the "deprecated" keyword is used to describe an array, it's meaning will