This quick fix should offer next:
1. Delete @Disposes annotation
2. Delete @Observes annotation

Test case:

EXECUTE: Create CDI project
EXECUTE: Create TestBean class

package org.test;

import javax.enterprise.event.Observes;
import javax.enterprise.inject.Disposes;
import javax.enterprise.inject.Produces;

public class TestBean {
	@Produces
	public String produce(){
		return "a";
	}
	
	public void method(@Observes String param1, @Disposes String param2){
		
	}
}

ASSERT: @Observes and @Disposes annotations should be marked by problem markers
EXECUTE: Point mouse to @Observes or @Disposes annotations
ASSERT: Text hover with quick fixes appears