A DESCRIPTION OF THE PROBLEM :
It appears for JDK 10 the URL fragment format for method links changed, not replacing brackets with `-` anymore:
- JDK < 10: https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html#clone--
- JDK >= 10: https://docs.oracle.com/javase/10/docs/api/java/lang/Object.html#clone()

The problem is that if you use the javadoc tool and specify an external `-link`, javadoc appears to always use the method URL fragment format of its version, which is possibly incorrect.

The most robust way to solve this would be to have `javadoc` generate a machine-readable file (similar to `package-list`) which specifies the javadoc / Standard Doclet version used (unless this represents sensitive information?), so another library generating javadoc against that external documentation can generate the correct links.
Relying on `--release` or `-source` passed to `javadoc` does not work because external libraries might have used an older version of `javadoc` to create their documentation.

Note that `-linkoffline` would have to support that in some (backward compatible) way as well.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Create a file called `Javadoc.java` containing the source code provided below
2. Use JDK 11 (or newer) javadoc: `javadoc -d javadoc -link https://docs.oracle.com/javase/8/docs/api ./Javadoc.java`
3. Open the generated `javadoc/index.html` in your browser
4. Click on the external "Object.clone()" link
-> Notice that it does not scroll to the "clone" method


---------- BEGIN SOURCE ----------
/**
 * @see java.lang.Object#clone()
 */
public class Javadoc {
}
---------- END SOURCE ----------