Improve API documentation of ClassLoader and ServiceLoader with respect to enumeration of resources.

ClassLoader API documentation of getResource() should recommend that getResource() and getResources() are kept consistent - something like:

<< A subclass of ClassLoader that overrides getResource() to
implement an alternate search algorithm for locating resources
should also override getResources() to reflect that same
order >>

ServiceLoader documentation could be improved with an @implNote stating that the resources are returned in the order defined by ClassLoader,getResources().