misc: remove bogus quotation marks

env.example

@@ -15,7 +15,7 @@ HTTPS_PORT=8443
 TZ=Europe/Amsterdam
 
 # Public URL for the web service.
-#PUBLIC_URL="https://meet.example.com"
+#PUBLIC_URL=https://meet.example.com
 
 # IP address of the Docker host. See the "Running on a LAN environment" section
 # in the README.