doc: restore spawn+shell list item with DEP0190 ref

Apply remaining review suggestions from aduh95:
- Add spawn+shell back to the list with (not recommended, see DEP0190)
- Fix DEP0190 link reference to use full anchor

Author: kovan

doc/api/child_process.md

@@ -120,6 +120,7 @@ however, `.bat` and `.cmd` files are not executable on their own without a
 terminal, and therefore cannot be launched using [`child_process.execFile()`][].
 When running on Windows, `.bat` and `.cmd` files can be invoked by:
 
+* using [`child_process.spawn()`][] with the `shell` option set (not recommended, see [DEP0190][]), or
 * using [`child_process.exec()`][], or
 * spawning `cmd.exe` and passing the `.bat` or `.cmd` file as an argument
   (which is what [`child_process.exec()`][] does internally).
@@ -2355,7 +2356,7 @@ Therefore, this feature requires opting in by setting the
 or [`child_process.fork()`][].
 
 [Advanced serialization]: #advanced-serialization
-[DEP0190]: deprecations.md#DEP0190
+[DEP0190]: deprecations.md#dep0190-passing-args-to-nodechild_process-execfilespawn-with-shell-option-true
 [Default Windows shell]: #default-windows-shell
 [HTML structured clone algorithm]: https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Structured_clone_algorithm
 [Shell requirements]: #shell-requirements