Formatting for reverse-proxy docs (#7514)

also a small clarification to nginx

changelog.d/7514.doc

@@ -0,0 +1 @@
+Improve the formatting of `reverse_proxy.md`.

docs/reverse_proxy.md

@@ -34,6 +34,7 @@ the reverse proxy and the homeserver.
 
 ### nginx
 
+```
 server {
     listen 443 ssl;
     listen [::]:443 ssl;
@@ -58,12 +59,14 @@ the reverse proxy and the homeserver.
         proxy_set_header X-Forwarded-For $remote_addr;
     }
 }
+```
 
-> **NOTE**: Do not add a `/` after the port in `proxy_pass`, otherwise nginx will
+**NOTE**: Do not add a path after the port in `proxy_pass`, otherwise nginx will
 canonicalise/normalise the URI.
 
 ### Caddy 1
 
+```
 matrix.example.com {
   proxy /_matrix http://localhost:8008 {
     transparent
@@ -75,9 +78,11 @@ canonicalise/normalise the URI.
     transparent
   }
 }
+```
 
 ### Caddy 2
 
+```
 matrix.example.com {
   reverse_proxy /_matrix/* http://localhost:8008
 }
@@ -85,9 +90,11 @@ canonicalise/normalise the URI.
 example.com:8448 {
   reverse_proxy http://localhost:8008
 }
+```
 
 ### Apache
 
+```
 <VirtualHost *:443>
     SSLEngine on
     ServerName matrix.example.com;
@@ -105,11 +112,13 @@ canonicalise/normalise the URI.
     ProxyPass /_matrix http://127.0.0.1:8008/_matrix nocanon
     ProxyPassReverse /_matrix http://127.0.0.1:8008/_matrix
 </VirtualHost>
+```
 
-> **NOTE**: ensure the  `nocanon` options are included.
+**NOTE**: ensure the  `nocanon` options are included.
 
 ### HAProxy
 
+```
 frontend https
   bind :::443 v4v6 ssl crt /etc/ssl/haproxy/ strict-sni alpn h2,http/1.1
 
@@ -125,6 +134,7 @@ canonicalise/normalise the URI.
 
 backend matrix
   server matrix 127.0.0.1:8008
+```
 
 ## Homeserver Configuration