Clarify the signals example slightly

Based on feedback in #402

public/testing

@@ -47,7 +47,7 @@ typically lives in the same package as the code it tests.</p>
 
           </td>
           <td class="code leading">
-            <a href="http://play.golang.org/p/vY8PN0c6BSx"><img title="Run code" src="play.png" class="run" /></a><img title="Copy code" src="clipboard.png" class="copy" />
+            <a href="http://play.golang.org/p/ALL2BVLkYEr"><img title="Run code" src="play.png" class="run" /></a><img title="Copy code" src="clipboard.png" class="copy" />
           <pre class="chroma">
 <span class="kn">package</span> <span class="nx">main</span>
 </pre>
@@ -167,7 +167,7 @@ when executing <code>go test -v</code>.</p>
           <td class="docs">
             
           </td>
-          <td class="code">
+          <td class="code leading">
             
           <pre class="chroma">        <span class="nx">testname</span> <span class="o">:=</span> <span class="nx">fmt</span><span class="p">.</span><span class="nf">Sprintf</span><span class="p">(</span><span class="s">&#34;%d,%d&#34;</span><span class="p">,</span> <span class="nx">tt</span><span class="p">.</span><span class="nx">a</span><span class="p">,</span> <span class="nx">tt</span><span class="p">.</span><span class="nx">b</span><span class="p">)</span>
         <span class="nx">t</span><span class="p">.</span><span class="nf">Run</span><span class="p">(</span><span class="nx">testname</span><span class="p">,</span> <span class="kd">func</span><span class="p">(</span><span class="nx">t</span> <span class="o">*</span><span class="nx">testing</span><span class="p">.</span><span class="nx">T</span><span class="p">)</span> <span class="p">{</span>
@@ -178,6 +178,21 @@ when executing <code>go test -v</code>.</p>
         <span class="p">})</span>
     <span class="p">}</span>
 <span class="p">}</span>
+</pre>
+          </td>
+        </tr>
+        
+        <tr>
+          <td class="docs">
+            
+          </td>
+          <td class="code">
+            
+          <pre class="chroma"><span class="kd">func</span> <span class="nf">BenchmarkIntMin</span><span class="p">(</span><span class="nx">b</span> <span class="o">*</span><span class="nx">testing</span><span class="p">.</span><span class="nx">B</span><span class="p">)</span> <span class="p">{</span>
+    <span class="k">for</span> <span class="nx">i</span> <span class="o">:=</span> <span class="mi">0</span><span class="p">;</span> <span class="nx">i</span> <span class="p">&lt;</span> <span class="nx">b</span><span class="p">.</span><span class="nx">N</span><span class="p">;</span> <span class="nx">i</span><span class="o">++</span> <span class="p">{</span>
+        <span class="nf">IntMin</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>
+    <span class="p">}</span>
+<span class="p">}</span>
 </pre>
           </td>
         </tr>
@@ -229,7 +244,7 @@ when executing <code>go test -v</code>.</p>
     </div>
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+      codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A    \"fmt\"\u000A    \"testing\"\u000A)\u000A');codeLines.push('func IntMin(a, b int) int {\u000A    if a \u003C b {\u000A        return a\u000A    }\u000A    return b\u000A}\u000A');codeLines.push('func TestIntMinBasic(t *testing.T) {\u000A    ans :\u003D IntMin(2, -2)\u000A    if ans !\u003D -2 {\u000A');codeLines.push('        t.Errorf(\"IntMin(2, -2) \u003D %d; want -2\", ans)\u000A    }\u000A}\u000A');codeLines.push('func TestIntMinTableDriven(t *testing.T) {\u000A    var tests \u003D []struct {\u000A        a, b int\u000A        want int\u000A    }{\u000A        {0, 1, 0},\u000A        {1, 0, 0},\u000A        {2, -2, -2},\u000A        {0, -1, -1},\u000A        {-1, 0, -1},\u000A    }\u000A');codeLines.push('    for _, tt :\u003D range tests {\u000A');codeLines.push('        testname :\u003D fmt.Sprintf(\"%d,%d\", tt.a, tt.b)\u000A        t.Run(testname, func(t *testing.T) {\u000A            ans :\u003D IntMin(tt.a, tt.b)\u000A            if ans !\u003D tt.want {\u000A                t.Errorf(\"got %d, want %d\", ans, tt.want)\u000A            }\u000A        })\u000A    }\u000A}\u000A');codeLines.push('func BenchmarkIntMin(b *testing.B) {\u000A    for i :\u003D 0; i \u003C b.N; i++ {\u000A        IntMin(1, 2)\u000A    }\u000A}\u000A');codeLines.push('');
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