Document Range.clone-with-op.

See issue #1798.

Author: fluca1978

doc/Type/Range.pod6

@@ -309,6 +309,28 @@ 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 specified 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
+=end code
+
+The method applies the specified operator to the C<min> and C<max>
+properties of the C<Range>.
+
 =end pod
 
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