_content/doc/tutorial: remove unused import "time"

`Time` was used by `math/rand.Seed` that is removed

Change-Id: I8e7feadce9712bf6e541321187a64da9209660fa
GitHub-Last-Rev: f3ec60a3a42b7b53d84425366b5d37a35bea1820
GitHub-Pull-Request: golang/website#227
Reviewed-on: https://go-review.googlesource.com/c/website/+/497836
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
diff --git a/_content/doc/tutorial/random-greeting.html b/_content/doc/tutorial/random-greeting.html
index 86e580e..ee65a08 100644
--- a/_content/doc/tutorial/random-greeting.html
+++ b/_content/doc/tutorial/random-greeting.html
@@ -36,8 +36,7 @@
 import (
     "errors"
     "fmt"
-    <ins>"math/rand"
-    "time"</ins>
+    <ins>"math/rand"</ins>
 )
 
 // Hello returns a greeting for the named person.