Spring NestedRuntimeException javadoc not updated after implementation change

Affects: 6.0.10

This is a trivial documentation issue. With #25162 the nested expection information was removed from the NestedRuntimeExceptions getMessage output. getMessage now also only delegates to the wrapped exception.

But the NestedRuntimeExceptions class JavaDoc still mentions the old getMessage behavior (see here).

Same is probably true for NestedCheckedException.java.