docs: Shorten the php_fastcgi expanded form a bit (#131)

Just making use of the matcher shortcuts we have available to make it look a little less fluffy.

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

@@ -53,26 +53,20 @@ The `php_fastcgi` directive is the same as the following configuration:
 route {
 	# Add trailing slash for directory requests
 	@canonicalPath {
-		file {
+		file {path}/index.php
-			try_files {path}/index.php
-		}
 		not path */
 	}
 	redir @canonicalPath {path}/ 308
 
 	# If the requested file does not exist, try index files
-	@indexFiles {
+	@indexFiles file {
-		file {
 		try_files {path} {path}/index.php index.php
 		split_path .php
 	}
-	}
 	rewrite @indexFiles {http.matchers.file.relative}
 
 	# Proxy PHP files to the FastCGI responder
-	@phpFiles {
+	@phpFiles path *.php
-		path *.php
-	}
 	reverse_proxy @phpFiles <php-fpm_gateway> {
 		transport fastcgi {
 			split .php