[io grant] Expand IO::Handle/IO::Pipe.path docs

- Add better example
- Add docs for its value in IO::Pipe, per:
    Impl: rakudo/rakudo@d46e8df4cb
    Tests: Raku/roast@637500da24

Author: zoffixznet

doc/Type/IO/Handle.pod6

@@ -274,12 +274,12 @@ mode.
 
 =head2 method path
 
-For a handle opened on a file this returns the L<IO::Path|/type/IO::Path> that represents
-the file. For the standard I/O handles C<$*IN>, C<$*OUT> and C<$*ERR> it returns a
-L<IO::Special|/type/IO::Special> object.
+For a handle opened on a file this returns the L<IO::Path|/type/IO::Path> that
+represents the file. For the standard I/O handles C<$*IN>, C<$*OUT>,
+and C<$*ERR> it returns an L<IO::Special|/type/IO::Special> object.
 
 =for code :skip-test
-$fh.path;
+    say "foo".IO.open.path; # OUTPUT: «"foo".IO␤»
 
 =head2 method close