Update rule description (#42)

* updates to rule description

Reworked the rule description section to include scope and expand on the bullets.

* Minor changes to the updated rule description

Minor changes to the updated rule description

* Mades updates based on Mary Jo's comments

* Update act-framework.bs

Based on the agreement during the Jan 25 call, removed the additional bullets so as to not duplicate the information in the rule outline.

* Update act-framework.bs

act-framework.bs

@@ -50,10 +50,9 @@ Rule Description {#structure-description}
 
 Each ACT Rule MUST have a description that:
 
-* Is in plain language;
-* Explains the accessibility requirement being tested;
-* Lists any limitations and assumptions for the test;
-* Explains the failure conditions and their reasons.
+* Is in plain language and provides a brief explanation of what the rule does.
+* Explains the accessibility requirement being tested such as the WCAG Success Criterion.
+* Refers to any related information, such as the WCAG Techniques it maps to; For example WCAG 2.0, Technique H67.
 
 
 ACT Input Data {#input}