[~alanb] reports a number of false positives for "Related Packages", such that we need to modify the heuristics or disable the feature for now.

For example, the Attach API (com.sun.tools.attach) is claiming incorrectly that javac (com.sun.tools.javac) is a related API.

One possibility that may be worth investigating is to exclude sibling packages when the parent package is either empty (no classes or interfaces) or is not an exported package of any module.