level/generator: populate missing return type information

src/pocketmine/level/generator/populator/Ore.php

@@ -48,6 +48,8 @@ class Ore extends Populator{
 
 	/**
 	 * @param OreType[] $types
+	 *
+	 * @return void
 	 */
 	public function setOreTypes(array $types){
 		$this->oreTypes = $types;

src/pocketmine/level/generator/populator/Pond.php

@@ -49,14 +49,29 @@ class Pond extends Populator{
 		}
 	}
 
+	/**
+	 * @param int $waterOdd
+	 *
+	 * @return void
+	 */
 	public function setWaterOdd(int $waterOdd){
 		$this->waterOdd = $waterOdd;
 	}
 
+	/**
+	 * @param int $lavaOdd
+	 *
+	 * @return void
+	 */
 	public function setLavaOdd(int $lavaOdd){
 		$this->lavaOdd = $lavaOdd;
 	}
 
+	/**
+	 * @param int $lavaSurfaceOdd
+	 *
+	 * @return void
+	 */
 	public function setLavaSurfaceOdd(int $lavaSurfaceOdd){
 		$this->lavaSurfaceOdd = $lavaSurfaceOdd;
 	}

src/pocketmine/level/generator/populator/TallGrass.php

@@ -37,6 +37,8 @@ class TallGrass extends Populator{
 
 	/**
 	 * @param int $amount
+	 *
+	 * @return void
 	 */
 	public function setRandomAmount($amount){
 		$this->randomAmount = $amount;
@@ -44,6 +46,8 @@ class TallGrass extends Populator{
 
 	/**
 	 * @param int $amount
+	 *
+	 * @return void
 	 */
 	public function setBaseAmount($amount){
 		$this->baseAmount = $amount;

src/pocketmine/level/generator/populator/Tree.php

@@ -49,6 +49,8 @@ class Tree extends Populator{
 
 	/**
 	 * @param int $amount
+	 *
+	 * @return void
 	 */
 	public function setRandomAmount($amount){
 		$this->randomAmount = $amount;
@@ -56,6 +58,8 @@ class Tree extends Populator{
 
 	/**
 	 * @param int $amount
+	 *
+	 * @return void
 	 */
 	public function setBaseAmount($amount){
 		$this->baseAmount = $amount;