More consistent use of so instead of Bool in regex examples

doc/Language/regexes.pod

@@ -340,34 +340,34 @@ To quantify an atom an arbitrary number of times, you can write e.g.
 C<a ** 2..5> to match the character C<a> at least twice and at most 5 times.
 
 =begin code
-    say Bool('a' ~~ /a ** 2..5/);    # False
-    say Bool('aaa' ~~ /a ** 2..5/);  # True
+    say so 'a' ~~ /a ** 2..5/;        # False
+    say so  'aaa' ~~ /a ** 2..5/;     # True
 =end code
 
 If the minimal and maximal number of matches are the same, a single integer
 is possible: C<a ** 5> matches C<a> exactly five times.
 
 =begin code
-    say Bool('aaaaa' ~~ /a ** 5/);   # True
+    say so 'aaaaa' ~~ /a ** 5/;       # True
 =end code
 
 It is also possible to use non inclusive ranges using a caret:
 
 =begin code
-    say Bool('a' ~~ /a ** 1^..^6);    # False
-    say Bool('aaaa' ~~ /a ** 1^..^6); # True
+    say so 'a' ~~ /a ** 1^..^6;       # False
+    say so 'aaaa' ~~ /a ** 1^..^6;    # True
 =end code
 
 This includes the numeric ranges starting from 0:
 
 =begin code
-    say Bool('aaa' ~~ /a ** ^6/);     # True
+    say so 'aaa' ~~ /a ** ^6/;        # True
 =end code
 
 or a Whatever operator for an infinite range with a non inclusive minimum:
 
 =begin code
-    say Bool('aaaa' ~~ /a ~~ 1^..*/); # True
+    say so 'aaaa' ~~ /a ~~ 1^..*/;    # True
 =end code
 
 =head2 X<Modified quantifier: %|regex,%;regex,%%>