Fix some typos: 0 --> O

Author: ShapelessCat

src/script/scala/progscala3/objectsystem/hashcode/CaseObjectHashCode.scala

@@ -12,5 +12,5 @@ println(s"O1:           ${O1.hashCode} == ${"O1".hashCode}")
 println(s"O2:           ${O2.hashCode} == ${"O2".hashCode}")
 println(s"O3:           ${O3.hashCode} != ${"O3".hashCode}")
 println(s"O3.O4:        ${O3.O4.hashCode} != ${"O3.O4".hashCode}")
-println(s"03.04 vs. 04: ${O3.O4.hashCode} == ${"O4".hashCode}")
-println(s"03.04 vs. 03: ${O3.O4.hashCode} != ${"O3".hashCode}")
+println(s"O3.O4 vs. O4: ${O3.O4.hashCode} == ${"O4".hashCode}")
+println(s"O3.O4 vs. O3: ${O3.O4.hashCode} != ${"O3".hashCode}")