playground: mention vet in about text

Fixes golang/go#25462

Change-Id: I11b861352b53f9492cd1f5c6d8c434edd68e4bd9
Reviewed-on: https://go-review.googlesource.com/c/140497
Reviewed-by: Andrew Bonventre <andybons@golang.org>
diff --git a/edit.html b/edit.html
index f3cd3be..f783dd6 100644
--- a/edit.html
+++ b/edit.html
@@ -136,7 +136,7 @@
 <p>
 The Go Playground is a web service that runs on
 <a href="https://golang.org/">golang.org</a>'s servers.
-The service receives a Go program, compiles, links, and
+The service receives a Go program, <a href="https://golang.org/cmd/vet/">vets</a>, compiles, links, and
 runs the program inside a sandbox, then returns the output.
 </p>