Merge pull request #333 from autocrypt/piggyrefine

address piggypacking concern

doc/_templates/customindex.html

@@ -42,13 +42,12 @@ <h2>What is Autocrypt?</h2>
     <p>
       Autocrypt is a set of guidelines for developers to achieve
       convenient end-to-end-encryption of e-mails.
-      It specifies how e-mail programs transparently negotiate and expose
-      end-to-end encryption capabilities to users. 
-
+      It specifies how e-mail programs negotiate encryption
+      capabilities by piggypacking on regular e-mails. 
     </p>
     <p>
       <a href="{{ pathto('level1') }}">Autocrypt Level 1</a>
-      offers single-click, opt-in encryption, eases encrypted
+      offers users single-click, opt-in encryption, eases encrypted
       group communications and provides a way to 
       setup encryption on multiple devices. 
     </p>