Updated 2nd callout to add 's' to sample value for httpsproxy field.

Author: mjpytlak

modules/installation-configure-proxy.adoc

@@ -81,7 +81,7 @@ apiVersion: v1
 baseDomain: my.domain.com
 proxy:
   httpProxy: http://<username>:<pswd>@<ip>:<port> <1>
-  httpsProxy: http://<username>:<pswd>@<ip>:<port> <2>
+  httpsProxy: https://<username>:<pswd>@<ip>:<port> <2>
   noProxy: example.com <3>
 additionalTrustBundle: | <4>
     -----BEGIN CERTIFICATE-----