doc: deprecate passing args to spawn and execFile

doc/api/deprecations.md

@@ -3843,6 +3843,21 @@ Type: Documentation-only
 `process.features.tls_alpn`, `process.features.tls_ocsp`, and `process.features.tls_sni` are
 deprecated, as their values are guaranteed to be identical to that of `process.features.tls`.
 
+### DEP0190: Passing `args` to `node:child_process` `execFile`/`spawn` with `shell` option `true`
+
+<!-- YAML
+changes:
+  - version:
+    - REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/57389
+    description: Documentation-only deprecation.
+-->
+
+Type: Documentation-only
+
+When an `args` array is passed to [`child_process.execFile`][] or [`child_process.spawn`][] with the option
+`{ shell: true }`, the values are not escaped, only space-separated, which can lead to shell injection.
+
 [NIST SP 800-38D]: https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38d.pdf
 [RFC 6066]: https://tools.ietf.org/html/rfc6066#section-3
 [RFC 8247 Section 2.4]: https://www.rfc-editor.org/rfc/rfc8247#section-2.4
@@ -3870,6 +3885,8 @@ deprecated, as their values are guaranteed to be identical to that of `process.f
 [`assert`]: assert.md
 [`asyncResource.runInAsyncScope()`]: async_context.md#asyncresourceruninasyncscopefn-thisarg-args
 [`buffer.subarray`]: buffer.md#bufsubarraystart-end
+[`child_process.execFile`]: child_process.md#child_processexecfilefile-args-options-callback
+[`child_process.spawn`]: child_process.md#child_processspawncommand-args-options
 [`child_process`]: child_process.md
 [`clearInterval()`]: timers.md#clearintervaltimeout
 [`clearTimeout()`]: timers.md#cleartimeouttimeout