Document .DESTROY doesn't close standard handles

Author: zoffixznet

doc/Type/IO/Handle.pod6

@@ -182,7 +182,10 @@ Defined as:
 
     submethod DESTROY(IO::Handle:D:)
 
-Closes the filehandle. Note that garbage collection is not guaranteed to
+Closes the filehandle, unless its L<native-descriptor> is C<2> or lower. This
+ensures the standard file handles do not get inadvertently closed.
+
+Note that garbage collection is not guaranteed to
 happen, so you must NOT rely on C<DESTROY> for closing the handles you
 I<write to> and instead close them yourself. Programs that open a lot of files
 should close the handles explicitly as well, regardless of whether they were