examples/hosted-counter-metamask: update blurb (#56)

Author: Twey

examples/hosted-counter-metamask/index.html

@@ -21,12 +21,15 @@
     <div class="container">
       <div class="content">
         <div class="description">
-          <h1>Counter</h1>
+          <h1>MetaMask Counter</h1>
           <p>
-            This is a simple application tracking some on-chain state that remembers the value of an integer counter.
+            This is a simple application tracking some on-chain state that remembers the value of an integer counter, with transactions signed by MetaMask.
           </p>
           <p>
-            Click the button to submit a block that increments the counter, and watch your local node's state update in real-time.
+            You'll need to have MetaMask installed and connected to the page for this demo to run.
+          </p>
+          <p>
+            Click the button to ask MetaMask to sign a block with your key that increments the counter.
           </p>
         </div>
         <div class="ui">