squelch the error message in the Apache startup

https://github.com/dom111/webdav-js/pull/21#discussion_r233018107

examples/apache-directory-list-local/webdav.conf

@@ -1,5 +1,5 @@
 <VirtualHost *:80>
-    ServerName localhost
+    ServerName webdav.server.com
     DocumentRoot /var/www/html/
 
 

examples/apache-directory-list/webdav.conf

@@ -1,5 +1,5 @@
 <VirtualHost *:80>
-    ServerName localhost
+    ServerName webdav.server.com
     DocumentRoot /var/www/html/