--override-methods=summary ignores some signature changes

A DESCRIPTION OF THE PROBLEM :
When using javadoc with `--override-methods=summary`, then some changes to the signature of the overriding method are ignored and the method is listed under "Methods declared in".

Affected changes:
- Covariant return type: JDK-8219147
- @Documented annotation on method or its parameters
- Changed `throws` clause:
  - Added unchecked exception
  - Removed exceptions
- Changed parameter name (could be intended)

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Create the javadoc for the classes below using `--override-methods=summary`.
2. Look at the doc for `Sub`

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The method `doSomething` is listed under "Method Detail" and the user sees the changes to its signature.
ACTUAL -
The method `doSomething` is listed under "Methods declared in"; the user does not see any of the changes to its signature.

---------- BEGIN SOURCE ----------
import java.lang.annotation.Documented;

@Documented
public @interface MyAnnotation { }

-----

public interface Parent {
    /**
     * Method
     *
     * @param a arg
     * @return value
     * @throws Exception never
     */
    Parent doSomething(int a) throws Exception;
}

-----

public interface Sub extends Parent {
    /*
     * Changes:
     * - Return type
     * - Used @Documented annotation:
     * - Method
     * - Parameter
     * - `throws` clause:
     * - Not throwing `Exception`
     * - Throwing `IllegalArgumentException`
     * - Parameter name (could be intended that change is ignored)
     */
    @Override
    @MyAnnotation
    Sub doSomething(@MyAnnotation int aNewName) throws IllegalArgumentException;
}
---------- END SOURCE ----------


It appears this also affects changes to the visibility:
public class A {
    /**
     * Does something
     */
    protected void doSomething() { }
}

public class B {
    @Override
    public void doSomething() { }
}

-----

The documentation for B does not show "doSomething" under "Method Detail" so the user does not know it is public.