tour: no deterministic note as 1.20 does rand seed

With go 1.20 "math/rand package now automatically seeds the global random number generator" (https://go.dev/doc/go1.20#math/rand) and we do not need the appengine specific note that the Go Playground environment for the tour programs is deterministic.

As the note is specific to the appengine version (i.e. it is already not shown in the Go offline tour) it should be fine to just remove the text.

Fixes golang/tour#1448

Change-Id: Ice84497dbe95c5e3e89fec2d44d4cb74bc2dd5be
GitHub-Last-Rev: b27bc7bf12bd8d7089a351a67a478dad6879adee
GitHub-Pull-Request: golang/website#194
Reviewed-on: https://go-review.googlesource.com/c/website/+/469575
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
diff --git a/_content/tour/basics.article b/_content/tour/basics.article
index 34a9b55..6c88005 100644
--- a/_content/tour/basics.article
+++ b/_content/tour/basics.article
@@ -14,13 +14,6 @@
 
 By convention, the package name is the same as the last element of the import path. For instance, the `"math/rand"` package comprises files that begin with the statement `package`rand`.
 
-#appengine: *Note:* The environment in which these programs are executed is
-#appengine: deterministic, so each time you run the example program
-#appengine: `rand.Intn` will return the same number.
-#appengine:
-#appengine: (To see a different number, seed the number generator; see [[/pkg/math/rand/#Seed][`rand.Seed`]].
-#appengine: Time is constant in the playground, so you will need to use something else as the seed.)
-
 .play basics/packages.go
 
 * Imports