Attempt to address feedback

Clarify that a transcript is a type of script in general usage.

index.html

@@ -158,7 +158,8 @@ <h2>Introduction</h2>
         <h3>Transcripts and Scripts</h3>
         <p>In general usage, one meaning of the word <em>script</em> is
           the written text of a film, television programme, play etc.
-          This can be either a record of the completed production
+          A script can be either a record of the completed production,
+          also known as a transcript,
           or as a plan for a yet to be created production.
           In this document, we use domain-specific terms, and define more specifically that:</p>
         <ul>