net/http: update net/http package to replace a broken link with an archive link

replaces broken link with a web.archive.org link.

Change-Id: I438536a6ac51d837c30be5df7d3d0caadf65bb95
GitHub-Last-Rev: 0601e4d6b2440f7fb97a6700b74651dc16645c50
GitHub-Pull-Request: golang/go#30523
Reviewed-on: https://go-review.googlesource.com/c/164761Reviewed-by: Bryan C. Mills <bcmills@google.com>

src/net/http/cgi/child.go

@@ -102,7 +102,7 @@ func RequestFromMap(params map[string]string) (*http.Request, error) {
 	}
 
 	// There's apparently a de-facto standard for this.
-	// https://docstore.mik.ua/orelly/linux/cgi/ch03_02.htm#ch03-35636
+	// https://web.archive.org/web/20170105004655/http://docstore.mik.ua/orelly/linux/cgi/ch03_02.htm#ch03-35636
 	if s := params["HTTPS"]; s == "on" || s == "ON" || s == "1" {
 		r.TLS = &tls.ConnectionState{HandshakeComplete: true}
 	}