doc: make it clear which pprof package is used

Updates #22027.

Change-Id: I5a5bae77a744c7a2ecb75172846e6461a98ee8af
Reviewed-on: https://go-review.googlesource.com/83916
Reviewed-by: Andrew Bonventre <andybons@golang.org>

diff --git a/doc/diagnostics.html b/doc/diagnostics.html
index 7a37dd98e4379ea7f3a24464b1c3ce8d402ee046..f9d230e6bc1847e03002bb92da89abda73d8e93d 100644 (file)
--- a/doc/diagnostics.html
+++ b/doc/diagnostics.html
@@ -185,9 +185,19 @@ handler on :7777 at /custom_debug_path/profile:
 
 <p>
 <pre>
-mux := http.NewServeMux()
-mux.HandleFunc("/custom_debug_path/profile", pprof.Profile)
-http.ListenAndServe(":7777", mux)
+package main
+
+import (
+       "log"
+       "net/http"
+       "net/http/pprof"
+)
+
+func main() {
+       mux := http.NewServeMux()
+       mux.HandleFunc("/custom_debug_path/profile", pprof.Profile)
+       log.Fatal(http.ListenAndServe(":7777", mux))
+}
 </pre>
 </p>