The Help page help-doc.html has a description of the "Use" page that
could be clearer:
(Among many other things, notice I deleted "any part of" after "fields use")

Use
      Each documented package, class and interface has its own Use page.
      You can access a Use page by first going to the package,
      class or interface page, then clicking on the "Use" link in
      the navigation bar. Note - The term "use" here means "appears in
      a signature" -- it does not mean referenced in an implementation.

      A Package Use page describes a high level view of what packages
      use the given package, and a lower-level view of what classes in
      other packages use classes in the given package. All the
      classes that appear in this list have a corresponding Class Use
      page that shows more detail. You can click on a class name to
      go to that Class Use page.

      A Class Use page describes what packages, classes, methods,
      constructors and fields use the given class.
      For example, given a class or interface A, its Use page includes
      subclasses of A, fields declared as A, methods that return A, and
      methods and constructors with parameters of type A.