Fix Done! spacing site-wide, and EN-only content errors (Docker/Linux mixup, missing spaces, ProloNAS pun explanation)

content/en/3.serveex/2.core/2.docker.md

@@ -37,7 +37,7 @@ sudo apt-get update
 sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
 ```
 
-### Done !
+### Done!
 ::
 
 **More options:** [Install Docker for Debian 13](https://docs.docker.com/engine/install/debian/)
@@ -153,7 +153,7 @@ Then go to `http://yourserverip:3555` in your browser to access the login page.
 
 More info on [Dockge and how to use it](https://github.com/louislam/dockge)
 
-#### Done !
+#### Done!
 ::
 
 And there you go! Docker and a tool to easily manage your containers are ready!
@@ -264,7 +264,7 @@ services:
 
 Then restart the modified stacks.
 
-#### Done !
+#### Done!
 ::
 
 And that's it! You now have a solid base to start deploying the services you want!