_config.yml: link to Lesson Life Cycle chapter of CDH

To help users of the lesson template understand how to choose/when to update the value of life_cycle

Author: tobyhodges

bin/boilerplate/_config.yml

@@ -13,7 +13,8 @@ carpentry: "swc"
 title: "Lesson Title"
 
 # Life cycle stage of the lesson
-# possible values: "pre-alpha", "alpha", "beta", "stable"
+# See this page for more details: https://cdh.carpentries.org/the-lesson-life-cycle.html
+# Possible values: "pre-alpha", "alpha", "beta", "stable"
 life_cycle: "pre-alpha"
 
 #------------------------------------------------------------