Add global config docs

v2:-Documentation.md

@@ -30,6 +30,7 @@ Features which are available in Caddy Enterprise are indicated with    🏢
 		- [Caddyfile adapter](#caddyfile-adapter)
 			- [Matcher tokens](#matcher-tokens)
 			- [Shorthand placeholders](#shorthand-placeholders)
+			- [Global config](#global-config)
 			- [Caddyfile directives](#caddyfile-directives)
 				- [root](#root)
 				- [matcher](#matcher)
@@ -430,6 +431,20 @@ The Caddyfile is supposed to be easy to write, so it also provides shorter place
 | {query}    | {http.request.uri.query}     |
 
 
+#### Global config
+
+The Caddyfile has a special place for specific settings that apply to the whole process rather than specifically per-site. This allows us to replace an arbitrary and growing number of CLI flags and environment variables, which constituted a large portion of hidden configuration in version 1.
+
+Simply create a server block with no keys to specify such global options. The following options are allowed:
+
+```
+{
+	http_port  <port>
+	https_port <port>
+}
+```
+
+
 #### Caddyfile directives
 
 ##### root
@@ -565,7 +580,7 @@ tls [off|<cert> <key>] {
 Rewrites a request based on the existence of the listed files on disk. Because this is a fairly common rewrite, this directive simply combines a `rewrite` handler with a `file` matcher for convenience in writing.
 
 ```
-try_files [<files...>]
+try_files <files...>
 ```