[devdocsgjs/main: 1578/1867] docs: add details about creating new VMs

[Andy Holmes <andyholmes src gnome org>]

commit 4479eeaa61455ac9c673ae9dd15ba36c1cc5be4b
Author: Oliver Eyton-Williams <ojeytonwilliams gmail com>
Date:   Thu Mar 25 11:54:51 2021 +0100

    docs: add details about creating new VMs

 docs/maintainers.md | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
diff --git a/docs/maintainers.md b/docs/maintainers.md
index 2641a1ed..2f2af797 100644
--- a/docs/maintainers.md
+++ b/docs/maintainers.md
@@ -92,7 +92,9 @@ If this is your first deploy, make sure another maintainer is around to assist.
 
 The bundled documents are available at downloads.devdocs.io and the documents themselves at 
documents.devdocs.io.  Download and document requests are proxied to S3 buckets 
devdocs-downloads.s3.amazonaws.com and devdocs-documents.s3.amazonaws.com respectively.
 
-If there's ever a need to create a new proxy VM (and the `devdocs-proxy` snapshot is not available) then the 
new vm should be provisioned as follows:
+New proxy VMs should be created from the `devdocs-proxy` snapshot.  Before adding them to the load-balancer, 
it's necessary to add their IP addresses to the aws:SourceIp lists for both buckets, or their requests will 
be rejected.
+
+When creating a new proxy VM and the `devdocs-proxy` snapshot is not available, then the new vm should be 
provisioned as follows:
 
 ```bash
 # we need at least nginx 1.19.x