Adds ⁇ ‼ to the index

And rephrases a bit the doc. Basically I was checking to close #1851,
and I don't like to close without an actual change. So...

doc/Language/operators.pod6

@@ -1922,13 +1922,11 @@ my %loser = points => 20, misses => 10;
 
 =head1 Conditional Operator Precedence
 
-=head2 infix C<?? !!>
+=head2 infix C<?? !!> X<|⁇ ‼>
 
-Also called X<Ternary operator|?? !!> or Conditional operator.
+Also called X<Ternary operator|?? !!> or conditional operator.
 
-C<$condition ?? $true !! $false> evaluates and returns the expression from the
-C<$true> branch if C<$condition> is a true value. Otherwise it evaluates and
-returns the C<$false> branch.
+C<$condition ?? $true !! $false> evaluates C<$condition> and returns the expression right behind ??, in this case C<$true> if it is C<True>, otherwise evaluates and returns the expression behind !!, C<$false> in this case.
 
 =head2 infix C«ff»