Update S-6602 message formatting for Stack RC

Author: david-christiansen

message-index/messages/S-6602/empty/index.md

@@ -2,13 +2,19 @@
 title: Stack does not accept empty YAML files
 ---
 
-When run with an empty YAML file, Stack fails to parse it. In particular, `stack --stack-yaml empty.yaml build` results in the error:
+When run with an empty YAML file, Stack fails to parse it. For example, `stack --stack-yaml empty.yaml build` results in the error:
 ```
 Error: [S-6602]
-Could not parse '/PATH/TO/empty.yaml':
-Aeson exception:
-Error in $: parsing ProjectAndConfigMonoid failed, expected Object, but encountered Null
-See http://docs.haskellstack.org/en/stable/yaml_configuration/
+       Stack could not load and parse /PATH/TO/empty.yaml as a YAML
+       configuraton file.
+       
+       While loading and parsing, Stack encountered the following exception:
+       
+       Aeson exception:
+       Error in $: parsing ProjectAndConfigMonoid failed, expected Object, but encountered Null
+       
+       For help about the content of Stack's YAML configuration files, see (for the most recent release of
+       Stack) http://docs.haskellstack.org/en/stable/yaml_configuration/.
 ```
 
 This can be fixed by specifying a resolver, which is the minimal `stack.yaml` configuration.