improve wording

Co-authored-by: Ben Hutton <[email protected]>

Author: karenetheridge

jsonschema-core.xml

@@ -2342,7 +2342,7 @@
                             An array instance is valid against "contains" if at least one of
                             its elements is valid against the given schema,
                             except when "minContains" is present and has a value of 0, in which
-                            case an array instance MUST be valid against the "contains" keyword,
+                            case an array instance MUST be considered valid against the "contains" keyword,
                             even if NONE of its elements is valid against the given schema.
                         </t>
                         <t>