getDesignTypeForProperty wrong code documentation

[mdbetancourt]

i notice the following documentation is not true

https://github.com/strongloop/loopback-next/blob/a666071e360b06c2f2c620d0aefd82d1ff38cf0c/packages/metadata/src/inspector.ts#L213-L215

there say

Design time metadata. The return value is undefined when:
The property has type undefined, null or a complex type like
Partial<MyModel>, string | number, string[].

but is only true for undefined and null because the anothers complex examples returns Object, Object, Array respectively