Clarify determinism of Go playground w.r.t. random numbers

Fixes #443

examples/random-numbers/random-numbers.go

@@ -32,7 +32,7 @@ func main() {
 	// produce the same sequence of numbers each time by default.
 	// To produce varying sequences, give it a seed that changes.
 	// Note that this is not safe to use for random numbers you
-	// intend to be secret, use `crypto/rand` for those.
+	// intend to be secret; use `crypto/rand` for those.
 	s1 := rand.NewSource(time.Now().UnixNano())
 	r1 := rand.New(s1)
 

examples/random-numbers/random-numbers.hash

@@ -1,2 +1,2 @@
-f0f88939692a32975d902c94066537a6ba5ab96f
-RaoKyUd9tgC
+ea6a386e4e5602247b2203fa433d4419ff5a9489
+Enb5uJEx0Bt

examples/random-numbers/random-numbers.sh

@@ -1,3 +1,8 @@
+# Depending on where you run this sample, some of the
+# generated numbers may be different. Note that on
+# the Go playground seeding with `time.Now()` still
+# produces deterministic results due to the way the
+# playground is implemented.
 $ go run random-numbers.go
 81,87
 0.6645600532184904

public/random-numbers

@@ -43,7 +43,7 @@ generation.</p>
             
           </td>
           <td class="code leading">
-            <a href="https://go.dev/play/p/RaoKyUd9tgC"><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/Enb5uJEx0Bt"><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>
           </td>
@@ -127,7 +127,7 @@ other ranges, for example <code>5.0 &lt;= f' &lt; 10.0</code>.</p>
 produce the same sequence of numbers each time by default.
 To produce varying sequences, give it a seed that changes.
 Note that this is not safe to use for random numbers you
-intend to be secret, use <code>crypto/rand</code> for those.</p>
+intend to be secret; use <code>crypto/rand</code> for those.</p>
 
           </td>
           <td class="code leading">
@@ -184,11 +184,17 @@ produces the same sequence of random numbers.</p>
         
         <tr>
           <td class="docs">
-            
+            <p>Depending on where you run this sample, some of the
+generated numbers may be different. Note that on
+the Go playground seeding with <code>time.Now()</code> still
+produces deterministic results due to the way the
+playground is implemented.</p>
+
           </td>
           <td class="code leading">
             
-          <pre class="chroma"><span class="gp">$</span> go run random-numbers.go
+          <pre class="chroma">
+<span class="gp">$</span> go run random-numbers.go
 <span class="go">81,87
 </span><span class="go">0.6645600532184904
 </span><span class="go">7.123187485356329,8.434115364335547