Fix link to http-server from context.go

Also rename .hash file for consistency

Fixes #603

examples/context/context.go

@@ -1,5 +1,5 @@
 // In the previous example we looked at setting up a simple
-// [HTTP server](http-servers). HTTP servers are useful for
+// [HTTP server](http-server). HTTP servers are useful for
 // demonstrating the usage of `context.Context` for
 // controlling cancellation. A `Context` carries deadlines,
 // cancellation signals, and other request-scoped values

examples/context/context.hash

@@ -1,2 +1,2 @@
-a9537bfea55bca15d8db1c453e2d9852f9d447e1
-0_bu1o8rIBO
+94a35a6172346b56737ed907a2320bd30f98995d
+7G1TlQrnbF1

public/context

@@ -31,7 +31,7 @@
         <tr>
           <td class="docs">
             <p>In the previous example we looked at setting up a simple
-<a href="http-servers">HTTP server</a>. HTTP servers are useful for
+<a href="http-server">HTTP server</a>. HTTP servers are useful for
 demonstrating the usage of <code>context.Context</code> for
 controlling cancellation. A <code>Context</code> carries deadlines,
 cancellation signals, and other request-scoped values
@@ -39,7 +39,7 @@ across API boundaries and goroutines.</p>
 
           </td>
           <td class="code leading">
-            <a href="https://go.dev/play/p/0_bu1o8rIBO"><img title="Run code" src="play.png" class="run" /></a><img title="Copy code" src="clipboard.png" class="copy" />
+            <a href="https://go.dev/play/p/7G1TlQrnbF1"><img title="Run code" src="play.png" class="run" /></a><img title="Copy code" src="clipboard.png" class="copy" />
           <pre class="chroma"><code><span class="line"><span class="cl"><span class="kn">package</span> <span class="nx">main</span></span></span></code></pre>
           </td>
         </tr>