Fix syntax problems in example Apache configuration

Related to #121 (Github Issue)

examples/apache/matrix-riot-web.conf

@@ -4,12 +4,12 @@
 <VirtualHost *:80>
 	ServerName riot.DOMAIN
 
+	ProxyVia On
+
 	# Map /.well-known/acme-challenge to the certbot server
 	# If you manage SSL certificates by yourself, this will differ.
 	<Location /.well-known/acme-challenge>
 		ProxyPreserveHost On
-		ProxyRequests Off
-		ProxyVia On
 		ProxyPass http://127.0.0.1:2402/.well-known/acme-challenge
 	</Location>
 

examples/apache/matrix-synapse.conf

@@ -3,12 +3,12 @@
 <VirtualHost *:80>
 	ServerName matrix.DOMAIN
 
+	ProxyVia On
+
 	# Map /.well-known/acme-challenge to the certbot server
 	# If you manage SSL certificates by yourself, this will differ.
 	<Location /.well-known/acme-challenge>
 		ProxyPreserveHost On
-		ProxyRequests Off
-		ProxyVia On
 		ProxyPass http://127.0.0.1:2402/.well-known/acme-challenge
 	</Location>