Links to external types always use the the string "class or interface in x.y.z" as title attribute (aka tooltip). This is unnecessarily generic, because we know what the external type is, and we already have the specific title attribute "class in x.y.z" or "interface in x.y.z".

Moreover, the same titile attribute is used for member links, which is slightly misleading. For methods, we should use the method signature as title attribute when the link label only contains the method name. For other member links, we usually don't set a title attribute.

Links to external types and their members should use the same title attributes as internal types and their members.