various: a grab-bag of time.Duration cleanups.

R=adg, r, rsc
CC=golang-dev
https://golang.org/cl/5475069
diff --git a/src/pkg/net/http/doc.go b/src/pkg/net/http/doc.go
index 9c47ac7..2dbcf8d 100644
--- a/src/pkg/net/http/doc.go
+++ b/src/pkg/net/http/doc.go
@@ -70,8 +70,8 @@
 	s := &http.Server{
 		Addr:           ":8080",
 		Handler:        myHandler,
-		ReadTimeout:    10e9,
-		WriteTimeout:   10e9,
+		ReadTimeout:    10 * time.Second,
+		WriteTimeout:   10 * time.Second,
 		MaxHeaderBytes: 1 << 20,
 	}
 	log.Fatal(s.ListenAndServe())