explicit way to express that those are different choice and not just one big file to create

Signed-off-by: gissehel <public-devgit-dantus@gissehel.org>

docs/installation/debian.md

@@ -63,12 +63,20 @@ from the new repository:
 
      The possible entries are:
 
-         # Debian Wheezy
-        deb https://apt.dockerproject.org/repo debian-wheezy main
-        # Debian Jessie
-        deb https://apt.dockerproject.org/repo debian-jessie main
-        # Debian Stretch/Sid
-        deb https://apt.dockerproject.org/repo debian-stretch main
+     - On Debian Wheezy
+
+            # Debian Wheezy
+            deb https://apt.dockerproject.org/repo debian-wheezy main
+
+    - On Debian Jessie
+
+            # Debian Jessie
+            deb https://apt.dockerproject.org/repo debian-jessie main
+
+    - On Debian Stretch/Sid
+
+            # Debian Stretch/Sid
+            deb https://apt.dockerproject.org/repo debian-stretch main
 
  8. Save and close the file.
 

docs/installation/ubuntulinux.md

@@ -67,14 +67,25 @@ packages from the new repository:
 
     The possible entries are:
 
-        # Ubuntu Precise 12.04 (LTS)
-        deb https://apt.dockerproject.org/repo ubuntu-precise main
-        # Ubuntu Trusty 14.04 (LTS)
-        deb https://apt.dockerproject.org/repo ubuntu-trusty main
-        # Ubuntu Vivid 15.04
-        deb https://apt.dockerproject.org/repo ubuntu-vivid main
-        # Ubuntu Wily 15.10
-        deb https://apt.dockerproject.org/repo ubuntu-wily main
+    - On Ubuntu Precise 12.04 (LTS)
+
+            # Ubuntu Precise 12.04 (LTS)
+            deb https://apt.dockerproject.org/repo ubuntu-precise main
+
+    - On Ubuntu Trusty 14.04 (LTS)
+
+            # Ubuntu Trusty 14.04 (LTS)
+            deb https://apt.dockerproject.org/repo ubuntu-trusty main
+
+    - On Ubuntu Vivid 15.04
+
+            # Ubuntu Vivid 15.04
+            deb https://apt.dockerproject.org/repo ubuntu-vivid main
+
+    - Ubuntu Wily 15.10
+
+            # Ubuntu Wily 15.10
+            deb https://apt.dockerproject.org/repo ubuntu-wily main
 
 7. Save and close the `/etc/apt/sources.list.d/docker.list` file.