fix typos and add clarifying text to boilerplate

Author: Sarah Brown

bin/boilerplate/_episodes/01-introduction.md

@@ -5,7 +5,7 @@ exercises: 0
 questions:
 - "Key question"
 objectives:
-- "First objective."
+- "First learning objective."
 keypoints:
-- "First key point."
----
+- "First key point. Brief Answer to questions."
+---

bin/boilerplate/index.md

@@ -1,10 +1,14 @@
 ---
 layout: lesson
-root: .  # Is the only page that don't follow the partner /:path/index.html
-permalink: index.html  # Is the only page that don't follow the partner /:path/index.html
+root: .  # Is the only page that doesn't follow the pattern /:path/index.html
+permalink: index.html  # Is the only page that doesn't follow the pattern /:path/index.html
 ---
 FIXME: home page introduction
 
+<!-- this is an html comment -->
+
+{% comment %} This is a comment in Liquid {% endcomment %}
+
 > ## Prerequisites
 >
 > FIXME