Clarify variable names in code example

By changing `n` and `e` to `name` and `num` it makes it clearer what
the bars are doing in each of the `for` loops and also makes it more
obvious that those values are being closed over for use in the innermost
print statement.

Author: bstrie

index.html

@@ -151,11 +151,11 @@ <h1>Rust <small>a safe, concurrent, practical language</small></h1>
 	  <div class="span10">
 <pre class="cm-s-default">
 <span class="cm-keyword">fn</span> <span class="cm-def">main</span>() {
-    <span class="cm-keyword">for</span> [<span class="cm-string">"Alice"</span>, <span class="cm-string">"Bob"</span>, <span class="cm-string">"Carol"</span>].<span class="cm-variable">each</span> |<span class="cm-variable">n</span>| {
+    <span class="cm-keyword">for</span> [<span class="cm-string">"Alice"</span>, <span class="cm-string">"Bob"</span>, <span class="cm-string">"Carol"</span>].<span class="cm-variable">each</span> |<span class="cm-variable">name</span>| {
         <span class="cm-keyword">do</span> <span class="cm-variable-2">task::</span><span class="cm-variable">spawn</span> {
             <span class="cm-keyword">let</span> <span class="cm-def">v</span> = <span class="cm-variable-2">rand::</span><span class="cm-variable">Rng</span>().<span class="cm-variable">shuffle</span>([<span class="cm-number">1</span>, <span class="cm-number">2</span>, <span class="cm-number">3</span>]);
-            <span class="cm-keyword">for</span> <span class="cm-variable">v</span>.<span class="cm-variable">each</span> |<span class="cm-variable">e</span>| {
-                <span class="cm-variable-2">io::</span><span class="cm-variable">print</span>(<span class="cm-variable-3">fmt!</span>(<span class="cm-string">"%s says: '%d'\n"</span>, <span class="cm-variable">n</span>, <span class="cm-variable">e</span>))
+            <span class="cm-keyword">for</span> <span class="cm-variable">v</span>.<span class="cm-variable">each</span> |<span class="cm-variable">num</span>| {
+                <span class="cm-variable-2">io::</span><span class="cm-variable">print</span>(<span class="cm-variable-3">fmt!</span>(<span class="cm-string">"%s says: '%d'\n"</span>, <span class="cm-variable">name</span>, <span class="cm-variable">num</span>))
             }
         }
     }