Big Caddyfile docs update (#374)

src/docs/markdown/caddyfile/directives/request_body.md

@@ -11,19 +11,22 @@ Manipulates or sets restrictions on the bodies of incoming requests.
 
 ```caddy-d
 request_body [<matcher>] {
-  max_size <value>
+	max_size <value>
 }
 ```
 
-- **max_size** is the maximum size in bytes allowed for the request body. It accepts all size values supported by [go-humanize](https://pkg.go.dev/github.com/dustin/go-humanize#pkg-constants). Reads of more bytes will return an error with HTTP status 413.
+- **max_size** is the maximum size in bytes allowed for the request body. It accepts all size values supported by [go-humanize](https://pkg.go.dev/github.com/dustin/go-humanize#pkg-constants). Reads of more bytes will return an error with HTTP status `413`.
 
 
 ## Examples
 
 Limit request body sizes to 10 megabytes:
 
-```caddy-d
-request_body {
-  max_size 10MB
+```caddy
+example.com {
+	request_body {
+		max_size 10MB
+	}
+	reverse_proxy localhost:8080
 }
 ```