Must quoute WEAVE_CIDR when it is a list

site/proxy.md

@@ -54,7 +54,7 @@ or, equivalently with
 
 Multiple IP addresses and networks can be supplied in the `WEAVE_CIDR`
 variable by space-separating them, as in
-`WEAVE_CIDR=10.2.1.1/24 10.2.2.1/24`.
+`WEAVE_CIDR="10.2.1.1/24 10.2.2.1/24"`.
 
 ## Usage with WeaveDNS