Update README.md

Author: johlju

README.md

@@ -339,7 +339,7 @@ The following opt-in flags are available:
   new error-level script analyzer rules are violated.
 - **Common Tests - Custom Script Analyzer Rules**: fail tests if any
   custom script analyzer rules are violated.
-* **Common Tests - Spellcheck Markdown Files**: fail test if there are any
+- **Common Tests - Spellcheck Markdown Files**: fail test if there are any
   spelling errors in the markdown files. There is the possibility to add
   or override words in the `\.vscode\cSpell.json` file.