#279: Minor edits to various Javadocs

src/main/java/org/bukkit/Nameable.java

@@ -2,6 +2,9 @@ package org.bukkit;
 
 import org.jetbrains.annotations.Nullable;
 
+/**
+ * Represents a block, entity, or other object that may receive a custom name.
+ */
 public interface Nameable {
 
     /**

src/main/java/org/bukkit/OfflinePlayer.java

@@ -10,6 +10,11 @@ import org.bukkit.profile.PlayerProfile;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
+/**
+ * Represents a reference to a player identity and the data belonging to a
+ * player that is stored on the disk and can, thus, be retrieved without the
+ * player needing to be online.
+ */
 public interface OfflinePlayer extends ServerOperator, AnimalTamer, ConfigurationSerializable {
 
     /**

src/main/java/org/bukkit/event/Cancellable.java

@@ -1,5 +1,8 @@
 package org.bukkit.event;
 
+/**
+ * A type characterizing events that may be cancelled by a plugin or the server.
+ */
 public interface Cancellable {
 
     /**

src/main/java/org/bukkit/plugin/java/JavaPlugin.java

@@ -30,7 +30,9 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 /**
- * Represents a Java plugin
+ * Represents a Java plugin and its main class. It contains fundamental methods
+ * and fields for a plugin to be loaded and work properly. This is an indirect
+ * implementation of {@link org.bukkit.plugin.Plugin}.
  */
 public abstract class JavaPlugin extends PluginBase {
     private boolean isEnabled = false;