Improve javadoc in 26 files.

Addresses:
BUKKIT-1643, BUKKIT-1868, BUKKIT-1846, BUKKIT-2632, BUKKIT-3196,
BUKKIT-3187, BUKKIT-3198, BUKKIT-3200, BUKKIT-3201 and BUKKIT-3417.

By: feildmaster <admin@feildmaster.com>

paper-api/src/main/java/org/bukkit/event/server/ServerListPingEvent.java

@@ -60,7 +60,7 @@ public class ServerListPingEvent extends ServerEvent {
     /**
      * Get the maximum number of players sent.
      *
-     * @return the the maximum number of player
+     * @return the maximum number of players
      */
     public int getMaxPlayers() {
         return maxPlayers;