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

Test case:

EXECUTE: Create CDI project
EXECUTE: Create TestBean class

package org.test;

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

public class TestBean {
	@Produces
	public String produceString(@Observes String aa){
		return "test";
	}
}

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

EXECUTE: Create TestBean2 class

package org.test;

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

public class TestBean2 {
	@Produces
	public String produceString(@Disposes String aaa){
		return "test";
	}
}

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