I would say the last method description is a bit confusing. If you look up InputStream#skip(long), you will find that you pass the number of bytes you want to skip, and the method returns the number of bytes actually skipped, which might be different. More information in that link.
Good point. It is a very brief summary, designed for limited space. But the "returns" part is just plain wrong - it doesn't return any skipped characters. Perhaps "Attempts to skip past the specified number of characters" would be better. Don't mention the return unless you can say what it's returning.