Updated code blocks and Russian text to match newer versions of Ruby. (ruby#3312)

Also made stylistic and punctuation corrections for the Russian translation.

Author: pasabanov

bg/documentation/quickstart/3/index.md

@@ -97,7 +97,7 @@ irb(main):043:0> g.respond_to?("to_s")
 irb(main):044:0> class Greeter
 irb(main):045:1>   attr_accessor :name
 irb(main):046:1> end
-=> nil
+=> [:name, :name=]
 {% endhighlight %}
 
 В Ruby лесно може да отворим класа отново за модификация. Промените ще

de/documentation/quickstart/3/index.md

@@ -104,7 +104,7 @@ die Variablen eines Objekts zu gewähren.
 irb(main):044:0> class Greeter
 irb(main):045:1>   attr_accessor :name
 irb(main):046:1> end
-=> nil
+=> [:name, :name=]
 {% endhighlight %}
 
 In Ruby kann man eine Klasse jederzeit verändern. Die Änderungen werden

en/documentation/quickstart/3/index.md

@@ -102,7 +102,7 @@ provides an easy way of providing access to an object’s variables.
 irb(main):044:0> class Greeter
 irb(main):045:1>   attr_accessor :name
 irb(main):046:1> end
-=> nil
+=> [:name, :name=]
 {% endhighlight %}
 
 In Ruby, you can reopen a class and modify it. The changes will

es/documentation/quickstart/3/index.md

@@ -104,7 +104,7 @@ una forma fácil para permitir acceder a las variables de un objeto.
 irb(main):044:0> class Anfitrion
 irb(main):045:1>   attr_accessor :nombre
 irb(main):046:1> end
-=> nil
+=> [:nombre, :nombre=]
 {% endhighlight %}
 
 En Ruby, puedes volver a abrir una clase y modificarla. Eso no cambia

fr/documentation/quickstart/3/index.md

@@ -111,7 +111,7 @@ pour accéder aux variables d’instances :
 irb(main):044:0> class Greeter
 irb(main):045:1>   attr_accessor :name
 irb(main):046:1> end
-=> nil
+=> [:name, :name=]
 {% endhighlight %}
 
 Il semblerait que nous ayons défini une seconde fois la classe

id/documentation/quickstart/3/index.md

@@ -106,7 +106,7 @@ Ruby menyediakan cara yang mudah untuk mengakses variabel objek.
 irb(main):044:0> class Greeter
 irb(main):045:1>   attr_accessor :name
 irb(main):046:1> end
-=> nil
+=> [:name, :name=]
 {% endhighlight %}
 
 Di Ruby, Anda dapat membuka lagi sebuah kelas dan memodifikasi kelas tersebut.

it/documentation/quickstart/3/index.md

@@ -101,7 +101,7 @@ per permetterci di accedere alle variabili di un oggetto.
 irb(main):044:0> class PersonaCordiale
 irb(main):045:1>   attr_accessor :nome
 irb(main):046:1> end
-=> nil
+=> [:nome, :nome=]
 {% endhighlight %}
 
 In Ruby, puoi aprire una classe e modificarla. I cambiamenti vengono

ja/documentation/quickstart/3/index.md

@@ -104,7 +104,7 @@ Rubyはオブジェクトの変数にアクセスできる簡単な方法を用
 irb(main):044:0> class Greeter
 irb(main):045:1>   attr_accessor :name
 irb(main):046:1> end
-=> nil
+=> [:name, :name=]
 {% endhighlight %}
 
 Rubyでは、定義されたクラスをさらに変更できます。

ko/documentation/quickstart/3/index.md

@@ -94,7 +94,7 @@ Ruby는 객체 변수를 접근하게 해주는 편리한 방법을 제공하고
 irb(main):044:0> class Greeter
 irb(main):045:1>   attr_accessor :name
 irb(main):046:1> end
-=> nil
+=> [:name, :name=]
 {% endhighlight %}
 
 Ruby에서는 클래스를 언제나 열어서 정의를 변경할 수 있습니다.

pl/documentation/quickstart/3/index.md

@@ -101,7 +101,7 @@ nam łatwy dostępn do zmiennych obiektu.
 irb(main):044:0> class Greeter
 irb(main):045:1>   attr_accessor :name
 irb(main):046:1> end
-=> nil
+=> [:name, :name=]
 {% endhighlight %}
 
 W Rubim możesz ponownie otworzyć klasę i zmodyfikować ją. To nie zmienia