Adds documentation for Unicode superscript ops closes #1098

doc/Language/operators.pod6

@@ -877,6 +877,17 @@ If the right-hand side is a non-negative integer and the left-hand side
 is an arbitrary precision type (L<Int>, L<FatRat>), then the calculation
 is carried out without loss of precision.
 
+Unicode superscripts will behave in exactly the same way.
+
+    sub squared( Int $num ) { $num² };
+    say squared($_) for ^5; OUTPUT: «0␤1␤4␤9␤16␤»
+
+It also works for sequences of several Unicode superscript numbers
+
+    sub twentytwoed( Int $num ) { $num²² };
+    say twentytwoed($_) for ^5; # OUTPUT: «0␤1␤4194304␤31381059609␤17592186044416␤»
+
+
 =head1 Symbolic unary precedence
 
 =head2 prefix C«?»