docs: small improvements

docs/en/ros.md

@@ -51,6 +51,9 @@ from std_msgs.msg import String
 # ...
 
 foo_pub = rospy.Publisher('/foo', String, queue_size=1)  # creating a Publisher
+
+# ...
+
 foo_pub.publish(data='Hello, world!')  # posting the message
 ```
 
@@ -103,4 +106,4 @@ Working on several PCs
 
 Main article: http://wiki.ros.org/ROS/Tutorials/MultipleMachines.
 
-The advantage of using ROS is the possibility of distributing the nodes across several PCs in the network. For example, a node that recognizes an image may be run on a more powerful PC; the node that controls the copter may be run directly on a Raspberry Pi connected to the flight controller, etc.
+The advantage of using ROS is the possibility of distributing the nodes across several PCs in the network. For example, a node that recognizes an image may be run on a more powerful PC; the node that controls the copter may be run directly on a Raspberry Pi connected to the flight controller, etc.

docs/ru/ros.md

@@ -14,6 +14,8 @@ ROS уже установлен на [образе для RPi](microsd_images.md
 
 Для использования ROS на компьютере рекомендуется ОС Ubuntu Linux (либо виртуальная машина, например [Parallels Desktop Lite](https://itunes.apple.com/ru/app/parallels-desktop-lite/id1085114709?mt=12) или [VirtualBox](https://www.virtualbox.org)).
 
+> **Note** Для дистрибутива ROS Kinetic рекомендуется Ubuntu версии 16.04.
+
 Концепции
 ---
 
@@ -51,6 +53,9 @@ from std_msgs.msg import String
 # ...
 
 foo_pub = rospy.Publisher('/foo', String, queue_size=1)  # создаем Publisher'а
+
+# ...
+
 foo_pub.publish(data='Hello, world!')  # публикуем сообщение
 ```