add clarification that minContains:0 also causes contains to pass

Author: gregsdennis

jsonschema-validation.xml

@@ -443,8 +443,8 @@
                     <t>
                         A value of 0 is allowed, but is only useful for setting a range
                         of occurrences from 0 to the value of "maxContains". A value of
-                        0 causes "minContains" to always pass validation (but validation can
-                        still fail against a "maxContains" keyword).
+                        0 causes "minContains" and "contains" to always pass validation
+                        (but validation can still fail against a "maxContains" keyword).
                     </t>
                     <t>
                         Omitting this keyword has the same behavior as a value of 1.