add another boolean format

Author: tbrowder

doc/Language/pod.pod6

@@ -50,8 +50,8 @@ Perl6-ish option pairs. That is, any of:
  ===============   ===================       ==============      =========== 
  List              :key[$e1,$e2,...]         :key($e1,$e2,...)
  Hash              :key{$k1=>$v1,$k2=>$v2}
- Boolean (true)    :key                      :key(True)
- Boolean (false)   :!key                     :key(False)
+ Boolean (true)    :key                      :key(True)          :key[True]
+ Boolean (false)   :!key                     :key(False)         :key[False]
  String            :key<str>                 :key('str')         :key("str")
  Number            :key(42)                  :key(2.3)
 =end table