Fix minor checkstyle issues

- Add JavaDoc where checkstyle expects it
- Fix line too long issues
- ...

src/main/java/fr/xephi/authme/process/email/AsyncAddEmail.java

@@ -32,6 +32,12 @@ public class AsyncAddEmail implements AsynchronousProcess {
 
     AsyncAddEmail() { }
 
+    /**
+     * Handles the request to add the given email to the player's account.
+     *
+     * @param player the player to add the email to
+     * @param email the email to add
+     */
     public void addEmail(Player player, String email) {
         String playerName = player.getName().toLowerCase();
 

src/main/java/fr/xephi/authme/process/email/AsyncChangeEmail.java

@@ -30,6 +30,13 @@ public class AsyncChangeEmail implements AsynchronousProcess {
 
     AsyncChangeEmail() { }
 
+    /**
+     * Handles the request to change the player's email address.
+     *
+     * @param player the player to change the email for
+     * @param oldEmail provided old email
+     * @param newEmail provided new email
+     */
     public void changeEmail(Player player, String oldEmail, String newEmail) {
         String playerName = player.getName().toLowerCase();
         if (playerCache.isAuthenticated(playerName)) {

src/main/java/fr/xephi/authme/process/login/AsynchronousLogin.java

@@ -269,6 +269,12 @@ public class AsynchronousLogin implements AsynchronousProcess {
         );
     }
 
+    /**
+     * Sends info about the other accounts owned by the given player to the configured users.
+     *
+     * @param auths the names of the accounts also owned by the player
+     * @param player the player
+     */
     private void displayOtherAccounts(List<String> auths, Player player) {
         if (!service.getProperty(RestrictionSettings.DISPLAY_OTHER_ACCOUNTS) || auths.size() <= 1) {
             return;

src/main/java/fr/xephi/authme/process/logout/AsynchronousLogout.java

@@ -12,6 +12,9 @@ import org.bukkit.entity.Player;
 
 import javax.inject.Inject;
 
+/**
+ * Async task when a player wants to log out.
+ */
 public class AsynchronousLogout implements AsynchronousProcess {
 
     @Inject
@@ -29,7 +32,12 @@ public class AsynchronousLogout implements AsynchronousProcess {
     AsynchronousLogout() {
     }
 
-    public void logout(final Player player) {
+    /**
+     * Handles a player's request to log out.
+     *
+     * @param player the player wanting to log out
+     */
+    public void logout(Player player) {
         final String name = player.getName().toLowerCase();
         if (!playerCache.isAuthenticated(name)) {
             service.send(player, MessageKey.NOT_LOGGED_IN);