Improved documentation about scope test format guidelines (#3029)

Author: AndreasArvidsson

packages/cursorless-org-docs/src/docs/contributing/scope-test-format.md

@@ -99,7 +99,7 @@ foo(aaa, bbb);
 
 ### Keep it compact
 
-Don't add more lines than the example actually needs. For example if the test is about the class name, the facet `name.class`: there is no point having a lot of code in the class body or having its span multiple lines.
+Don't add more lines than the example actually needs. For example if the test is about the class name, the facet `name.class`: there is no point having a lot of code in the class body or having it span multiple lines. Keep the code single line and with an empty body if possible.
 
 ```
         >---<