Document Instant.DateTime; curt_++

coverage report shows it as covered; so it's likely in roast

Author: zoffixznet

doc/Type/Instant.pod6

@@ -89,4 +89,14 @@ Returns a L<Date|/type/Date> object set to the date of the invocant.
     say $i;                                       # OUTPUT: «Instant:1451489025.878018␤»
     say $i.Date;                                  # OUTPUT: «2015-12-30␤»
 
+=head2 method DateTime
+
+Defined as:
+
+    method DateTime(Instant:D: --> DateTime:D)
+
+Coerces the invocant to L<DateTime>.
+
+    say now.DateTime;  # OUTPUT: «2017-05-09T14:02:58.147165Z␤»
+
 =end pod