[6.d] Document $()/@()/%() are no longer magical in 6.d

Per 6.d-prep: https://github.com/perl6/6.d-prep/blob/dffa2642419a0f481591b9b64b602bfc4c4eb66b/TODO/FEATURES.md#remove--magicalness-from--and-
Propspec: Raku/roast@79e86e5f14
POV: rakudo/rakudo@bb88a0324e

doc/Language/variables.pod6

@@ -1032,6 +1032,16 @@ say $/;
 #             textnode => ｢some text｣␤»
 =end code
 
+To get a stringified version of the L<Match> object, simply use the
+L<prefix ~ operator|https://docs.perl6.org/routine/~.html#(Operators)_prefix_~>.
+In 6.c language, you can use C<$()> shortcut (no spaces inside the parentheses).
+
+    'test' ~~ /.../;
+    say ~$/; # OUTPUT: «tes␤»
+
+    # 6.c language only:
+    say $(); # OUTPUT: «tes␤»;
+
 =head4 X«Positional attributes|variable,$0;variable,$1;variable,@()»
 
 C<$/> can have positional attributes if the L<Regex|/language/regexes> had
@@ -1046,9 +1056,12 @@ These can also be accessed by the shortcuts C<$0>, C<$1>, C<$2>, etc.
     say $0; # OUTPUT: «｢bbbbb｣␤»
     say $1; # OUTPUT: «｢dddddeff｣␤»
 
-To get all of the positional attributes, any of C<$/.list>, C<@$/>, or
-C<@()> can be used.
+To get all of the positional attributes, you can use C<$/.list> or C<@$/>. In 6.c language,
+you can also use the C<@()> shortcut (no spaces inside the parentheses).
 
+    say @$/.join; # OUTPUT: «bbbbbdddddeff␤»
+
+    # 6.c language only:
     say @().join; # OUTPUT: «bbbbbdddddeff␤»
 
 =head4 X«Named attributes|variable,$<named>;variable,%()»
@@ -1065,9 +1078,12 @@ These can also be accessed by the shortcut C«$<named>».
     say $<punctuation>; # OUTPUT: «｢....｣␤»
     say $<final-word>;  # OUTPUT: «｢see?｣␤»
 
-To get all of the named attributes, any of C<$/.hash>, C<%$/>, or C<%()> can
-be used.
+To get all of the named attributes, you can use C<$/.hash> or C<%$/>. In 6.c language, you
+can also use the C<%()> shortcut (no spaces inside the parentheses).
+
+    say %$/.join;       # OUTPUT: «"punctuation     ....final-word  see?"␤»
 
+    # 6.c language only
     say %().join;       # OUTPUT: «"punctuation     ....final-word  see?"␤»
 
 X<|error variable>