Revert "Document Range.clone-with-op."

Closes #1798 D#1798

It was never part of the Perl 6 language and its Rakudo
implementation has been now removed[^1]

[1] rakudo/rakudo@440fceacc2e2b31484aaa5

Author: zoffixznet

doc/Type/Range.pod6

@@ -309,37 +309,6 @@ L«C<.excludes-max>|/type/Range#method_excludes-max»,
 L«C<.infinite>|/type/Range#method_infinite», and
 L«C<.is-int>|/type/Range#method_is-int» as named arguments.
 
-
-=head2 method clone-with-op
-
-Defined as
-
-    method clone-with-op(&op, $value --> Range:D)
-
-The method clones the target range applying the specified
-operator C<op> with the specified C<value> to the current C<Range>
-boundaries.
-
-For instance:
-
-=begin code
-my $r = 1..5;
-my $r-plus     = $r.clone-with-op( &[+], 7 );   # produces 8..12
-my $r-minus    = $r.clone-with-op( &[-], 7 );   # produces -6..-2
-my $r-multiply = $r.clone-with-op( &[*], 2 );   # produces 2..10
-=end code
-
-The method applies the specified operator to the C<min> and C<max>
-properties of the C<Range>.
-
-It is possible to clone non-numeric ranges, but both the operator and
-value must be of the according type:
-
-=begin code
-my $r = 'a'..'c';
-my $r-cat = $r.clone-with-op( &[~], 'd' );  # produces 'ad'..'cd'
-=end code
-
 =end pod
 
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