engine/install: un-wrap repo setup command

These are not too long, so un-wrapping them to make the page a bit briefer.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

engine/install/centos.md

@@ -87,10 +87,7 @@ utility) and set up the repository.
 
 ```console
 $ sudo yum install -y yum-utils
-
-$ sudo yum-config-manager \
-    --add-repo \
-    {{ download-url-base }}/docker-ce.repo
+$ sudo yum-config-manager --add-repo {{ download-url-base }}/docker-ce.repo
 ```
 
 #### Install Docker Engine

engine/install/debian.md

@@ -87,11 +87,7 @@ Docker from the repository.
 
     ```console
     $ sudo apt-get update
-
-    $ sudo apt-get install \
-        ca-certificates \
-        curl \
-        gnupg
+    $ sudo apt-get install ca-certificates curl gnupg
     ```
 
 2.  Add Docker's official GPG key:

engine/install/fedora.md

@@ -79,10 +79,7 @@ your DNF repositories) and set up the repository.
 
 ```console
 $ sudo dnf -y install dnf-plugins-core
-
-$ sudo dnf config-manager \
-    --add-repo \
-    {{ download-url-base }}/docker-ce.repo
+$ sudo dnf config-manager --add-repo {{ download-url-base }}/docker-ce.repo
 ```
 
 #### Install Docker Engine

engine/install/rhel.md

@@ -89,10 +89,7 @@ utility) and set up the repository.
 
 ```console
 $ sudo yum install -y yum-utils
-
-$ sudo yum-config-manager \
-    --add-repo \
-    {{ download-url-base }}/docker-ce.repo
+$ sudo yum-config-manager --add-repo {{ download-url-base }}/docker-ce.repo
 ```
 
 #### Install Docker Engine

engine/install/ubuntu.md

@@ -85,11 +85,7 @@ Docker from the repository.
 
     ```console
     $ sudo apt-get update
-
-    $ sudo apt-get install \
-        ca-certificates \
-        curl \
-        gnupg
+    $ sudo apt-get install ca-certificates curl gnupg
     ```
 
 2.  Add Docker's official GPG key: