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

content/en/3.serveex/3.security/2.cloudflare.md

@@ -220,7 +220,7 @@ Then confirm your tunnel appears under _Networks > Tunnels_ in [Cloudflare Zero
 ![dns](/img/serveex/cf-dns.png)
 ::
 
-### Done !
+### Done!
 ::
 
 ## Managing Multiple Tunnels for Multiple Servers
@@ -246,7 +246,7 @@ In the [Cloudflare DNS dashboard](https://dash.cloudflare.com/), click your doma
 | `CNAME` | `subdomain1` | `yourtunnelid1.cfargotunnel.com`       |
 | `CNAME` | `subdomain2` | `yourtunnelid2.cfargotunnel.com`       |
 
-### Done !
+### Done!
 ::
 
 If you have many subdomains, point them to the above reference subdomains.