Improved try/catch/finally to explain the options better.

documentation/index.html.js

@@ -874,9 +874,9 @@ Expressions
     <p>
       <span id="try" class="bookmark"></span>
       <b class="header">Try/Catch/Finally</b>
-      Try/catch statements are just about the same as in JavaScript, with a few
-      additions: They work as expressions, and you may omit saving the error in
-      the catch—or the entire catch itself—if you don't need it.
+      Try-expressions have the same semantics as try-statements in JavaScript,
+      though in CoffeeScript, you may omit <em>both</em> the catch and finally
+      parts. The catch part may also omit the error parameter if it is not needed.
     </p>
     <%= codeFor('try') %>