lsp: templating add docs

Signed-off-by: Charlie Egan <charlie@styra.com>

docs/rules/idiomatic/directory-package-mismatch.md

@@ -97,6 +97,13 @@ demonstrates a new policy being created inside an `authorization/rbac/roles` dir
   src={require('../../assets/rules/pkg_name_completion.png').default}
   alt="Package path auto-completion in VS Code"/>
 
+In addition, when `regal fix` is enabled as a formatter, empty files will be be
+'formatted' to have the correct package based on the directory structure. Newly
+created Rego files are treated in much the same way. When a new file is created,
+the server will send a series of edits back to set the content. If
+`exclude-test-suffix` is set to `false`, the file will also be moved if required
+to the `_test` directory for that package.
+
 ## Configuration Options
 
 This linter rule provides the following configuration options: