better wording for output

gregsdennis · gregsdennis · commit 02295dc54633 · 2018-12-25T15:52:47.000+13:00
diff --git a/jsonschema-core.xml b/jsonschema-core.xml
@@ -2143,8 +2143,9 @@
                         </t>
                     </list>
                     Implementations MUST provide support for the "flag" format and SHOULD provide the
-                    "basic" and "detailed" formats.  The "verbose" format is OPTIONAL.  Implementations
-                    SHOULD specify in their documentation which formats of validation they support.
+                    "basic" and "detailed" formats, and MAY provide the "verbose" format.
+                    Implementations SHOULD specify in their documentation which formats of validation
+                    they support.
                 </t>
 
             </section>
