Fix comments and documentation that were missed during the review of #8712 (#8945)

src/main/java/net/minecraftforge/event/level/LevelEvent.java

@@ -131,7 +131,7 @@ public class LevelEvent extends Event
      *
      * <p>If an entry is added to the list, it needs to be a globally unique instance.</p>
      *
-     * The event is called in {@link net.minecraft.world.level.NaturalSpawner#getRandomSpawnMobAt(ServerLevel,
+     * The event is called in {@link net.minecraft.world.level.NaturalSpawner#mobsAt(ServerLevel,
      * StructureManager, ChunkGenerator, MobCategory, RandomSource, BlockPos)}.</p>
      * 
      * <p>This event is {@linkplain Cancelable cancellable}, and does not {@linkplain HasResult have a result}.

src/test/java/net/minecraftforge/debug/world/PotentialSpawnsEventTest.java

@@ -14,7 +14,7 @@ import net.minecraftforge.event.level.LevelEvent;
 import net.minecraftforge.fml.common.Mod;
 
 /**
- * <p>This tests net.minecraftforge.event.world.World.WorldEvent.PotentialSpawns. If ENABLED is set to true,
+ * <p>This tests net.minecraftforge.event.world.World.LevelEvent.PotentialSpawns. If ENABLED is set to true,
  * this test mod uses the PotentialSpawns event to prevent mobs in the MONSTER mob category from spawning if the
  * game difficulty is set to anything other than hard.</p>
  */