Use correct consistent name for the java package.

 It's `lp.$language` as with the already existing ones.

java/src/test/java/understanding/TestOutputParameters.java

package understanding;
package lp.java.understanding;
import org.junit.Test;
		this.tryAssigningAStringArgument(input, "will not be assigned");
		assertEquals(input, "the thing");
	}
	
	public void tryAssigningAStringArgument(String s, String assignment) {
		s = assignment;
	}