etc: minor yamlint syntax fixes

Signed-off-by: Joachim Wiberg <[email protected]>

Author: troglobit

etc/9pm-proj.yaml

@@ -1,7 +1,7 @@
 # This is the default project config for 9pm.
 # The top level "9pm" contains data aimed for the 9pm.py test executor.
 # This file is passed down to test cases as the env variable NINEPM_PROJ_CONFIG.
-
+---
 9pm:
   PROJECT-NAME: "9pm"
-  PROJECT-ROOT: "./"
+  PROJECT-ROOT: "./"