util: fix custom inspect description

Using a custom inspect function on the inspected object is
deprecated. Remove the reference from the option description
to make sure the user will read about the deprecation in the
more detailed description.

Backport-PR-URL: #19230
PR-URL: #17576
Reviewed-By: Anna Henningsen <anna@addaleax.net>

doc/api/util.md

@@ -342,8 +342,7 @@ changes:
     codes. Defaults to `false`. Colors are customizable, see
     [Customizing `util.inspect` colors][].
   * `customInspect` {boolean} If `false`, then custom `inspect(depth, opts)`
-    functions exported on the `object` being inspected will not be called.
-    Defaults to `true`.
+    functions will not be called. Defaults to `true`.
   * `showProxy` {boolean} If `true`, then objects and functions that are
     `Proxy` objects will be introspected to show their `target` and `handler`
     objects. Defaults to `false`.