Minor - Fix documentation issues in card_game plugin

plugin/card_game/README.md

@@ -17,7 +17,7 @@ execute the following changes in your database to update its structure.
 
 ##### Database changes
 You need execute these SQL queries in your database if you are upgrading to 
-Chamilo 1.11.8 and  
+Chamilo 1.11.8 and the card_game plugin was already installed in your previous version.
 
 ```sql
 ALTER TABLE plugin_card_game CHANGE COLUMN idUser user_id INT NOT NULL;

plugin/card_game/card_game.php

@@ -31,14 +31,15 @@ class CardGame extends Plugin
 
     public function install()
     {
+        // 'pan' is the ID of the current background image/panel
         $sql = "CREATE TABLE IF NOT EXISTS plugin_card_game(
             id INT NOT NULL AUTO_INCREMENT,
             user_id INT NOT NULL,
-				pan int NOT NULL, -- the ID of the current background image/panel
+            pan int NOT NULL,
             access_date DATE NOT NULL,
             parts VARCHAR(500) NOT NULL,
-				PRIMARY KEY (id));
+            PRIMARY KEY (id)
-        ";
+        )";
         Database::query($sql);
     }