doc: specify that preloaded modules affect subprocesses

Co-Authored-By: Tim Fish <tim@timfish.uk>
PR-URL: #52939
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

doc/api/cli.md

@@ -1390,6 +1390,9 @@ Follows [ECMAScript module][] resolution rules.
 Use [`--require`][] to load a [CommonJS module][].
 Modules preloaded with `--require` will run before modules preloaded with `--import`.
 
+Modules are preloaded into the main thread as well as any worker threads,
+forked processes, or clustered processes.
+
 ### `--input-type=type`
 
 <!-- YAML
@@ -2055,6 +2058,9 @@ Only CommonJS modules are supported.
 Use [`--import`][] to preload an [ECMAScript module][].
 Modules preloaded with `--require` will run before modules preloaded with `--import`.
 
+Modules are preloaded into the main thread as well as any worker threads,
+forked processes, or clustered processes.
+
 ### `--run`
 
 <!-- YAML