Add Override annotations where appropriate

By: md_5 <git@md-5.net>

paper-api/src/main/java/org/bukkit/util/BlockIterator.java

@@ -293,6 +293,7 @@ public class BlockIterator implements Iterator<Block> {
      * Returns true if the iteration has more elements
      */
 
+    @Override
     public boolean hasNext() {
         scan();
         return currentBlock != -1;
@@ -303,6 +304,7 @@ public class BlockIterator implements Iterator<Block> {
      *
      * @return the next Block in the trace
      */
+    @Override
     @NotNull
     public Block next() throws NoSuchElementException {
         scan();
@@ -313,6 +315,7 @@ public class BlockIterator implements Iterator<Block> {
         }
     }
 
+    @Override
     public void remove() {
         throw new UnsupportedOperationException("[BlockIterator] doesn't support block removal");
     }

paper-api/src/main/java/org/bukkit/util/Vector.java

@@ -846,6 +846,7 @@ public class Vector implements Cloneable, ConfigurationSerializable {
         return new Vector(random.nextDouble(), random.nextDouble(), random.nextDouble());
     }
 
+    @Override
     @NotNull
     public Map<String, Object> serialize() {
         Map<String, Object> result = new LinkedHashMap<String, Object>();