fixup! [multi-ssl] Backward compatibility with ssl_

plugins/ssl/ssl-certificate-expiry

@@ -10,7 +10,7 @@ multi_ssl - Plugin to monitor CERTificate expiration on multiple services and po
 =head1 CONFIGURATION
 
   [multi_ssl]
-    env.services www.service.tld blah.example.net:PORT
+    env.services www.service.tld blah.example.net_PORT
 
 To set warning and critical levels do like this:
 
@@ -20,7 +20,7 @@ To set warning and critical levels do like this:
 
 Alternatively, if you want to monitor hosts separately, you can create multiple symlinks named as follows.
 
-  multi_ssl_HOST:PORT
+  multi_ssl_HOST_PORT
 
 For example:
 
@@ -82,6 +82,7 @@ get_expire()
 	PORT=443
     fi
     if echo "$SITE" | grep -q ':'; then
+	# Wrap IPv6 addresses in square brackets
         SITE="[${SITE}]"
     fi