brackets → curly braces, add example refs #2114

Author: JJ

doc/Language/traps.pod6

@@ -82,7 +82,7 @@ A L<C<Match> will be C<Nil>|https://docs.perl6.org/language/regexes#Literals> if
 
 =head2 Beware of empty "blocks"
 
-Brackets are used to declare blocks. However, empty brackets will
+Curly braces are used to declare blocks. However, empty curly braces will
 declare a hash.
 
 =begin code
@@ -92,6 +92,12 @@ $ = {…}       # Block
 $ = { }       # Hash
 =end code
 
+You can use the second form if you effectively want to declare an empty block:
+
+    my &does-nothing = {;};
+    say does-nothing(33);# OUTPUT: «Nil␤»
+
+
 =head1 Objects
 
 =head2 Assigning to attributes