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

content/en/2.general/5.linux/1.cli-basics.md

@@ -32,7 +32,7 @@ Options change how a command behaves. They come in two flavours, and most comman
 - **Short**, a single dash and a single letter: `ls -a`. They can be stacked, so `ls -l -a -h` is usually written `ls -lah`.
 - **Long**, two dashes and a whole word: `ls --all`. Longer to type, but you can still tell what it does six months later, which is why they're the better choice in a script.
 
-Some options expect a value right after them: `ssh-keygen -t ed25519` (`-t` for type), `rsync --exclude @eaDir`. And case matters, always. In `ls`, `-r` reverses the sort order while `-R` walks into subfolders. Two different things, one letter apart.
+Some options expect a value right after them: `ssh-keygen -t ed25519` (`-t` for type), `rsync --exclude @eaDir`. And case matters, always. In `ls`, `-r` reverses the sort order while `-R` walks into subfolders. Same letter, different case.
 
 ### Arguments and paths