Improve documentation of S-6602

 * Correct Stack version
 * Global files also affected
 * More docs links

Author: david-christiansen

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

@@ -2,13 +2,13 @@
 title: Could not parse YAML configuration file
 summary: Test summary
 severity: error
-introduced: 2.10.0
+introduced: 2.9.3
 ---
 
-This error occurs when Stack is unable to parse a `stack.yaml` file. The error covers the following situations:
+This error occurs when Stack is unable to parse a YAML configuration file, which could be a project-level `stack.yaml` file or a global `config.yaml` file. The error covers the following situations:
 
  * The specified configuration file does not exist
  * The configuration file is not well-formed YAML
  * The file is well-formed YAML but does not match the expected data schema
 
-The expected file format is described in [the Stack documentation](https://docs.haskellstack.org/en/stable/yaml_configuration/).
+The expected file formats are described in [the Stack documentation](https://docs.haskellstack.org/en/stable/yaml_configuration/).