Document List.Capture stringifies .keys of Pairs

Rakudo impl: rakudo/rakudo@5b25836f21
Tests: Raku/roast@ae935c92eb

Author: zoffixznet

doc/Type/List.pod6

@@ -479,12 +479,13 @@ Defined as:
 
     method Capture(--> Capture:D)
 
-Returns a L<Capture|/type/Capture> where each L<Pair|/type/Pair>, if any, in
-the C<List> has been converted to a named argument. All other elements in the
-C<List> are converted to positional arguments in the order they are found,
-i.e. the first non pair item in the list becomes the first positional argument,
-which gets index C<0>, the second non pair item becomes the second positional
-argument, getting index C<1> etc.
+Returns a L<Capture> where each L<Pair>, if any, in the C<List> has been
+converted to a named argument (with the L<key|/type/Pair#method_key> of the
+L<Pair> stringified). All other elements in the C<List> are converted to
+positional arguments in the order they are found, i.e. the first non pair item
+in the list becomes the first positional argument, which gets index C<0>, the
+second non pair item becomes the second positional argument, getting
+index C<1> etc.
 
     my $list = (7, 5, a => 2, b => 17);
     my $capture = $list.Capture;