add (temporary) limitation caveat to findPackageJSON doc entry

Author: JakobJingleheimer

doc/api/module.md

@@ -81,14 +81,18 @@ added: v23.2.0
 * `base` {string|URL} The absolute location (`file:` URL string or FS path) of the
   containing  module. For CJS, use `__filename` (not `__dirname`!); for ESM, use
   `import.meta.url`. You do not need to pass it if `specifier` is an `absolute specifier`.
-* Returns: {string|undefined} A path if the `package.json` is found. When `startLocation`
+* Returns: {string|undefined} A path if the `package.json` is found. When `specifier`
   is a package, the package's root `package.json`; when a relative or unresolved, the closest
-  `package.json` to the `startLocation`.
+  `package.json` to the `specifier`.
 
 > **Caveat**: Do not use this to try to determine module format. There are many things effecting
 > that determination; the `type` field of package.json is the _least_ definitive (ex file extension
 > superceeds it, and a loader hook superceeds that).
 
+> **Caveat**: This currently leverages only the built-in default resolver; if
+> [`resolve` customization hooks][resolve hook] are registered, they will not effect the resolution.
+> This may change in future.
+
 ```text
 /path/to/project
   ├ packages/