README: don't recommend go get

These days people will just import the packages and the go tool will
do the right thing. We don't need to explain it.

Add a pointer to the git repo, though.

For golang/go#62645

Change-Id: Ia5a16d8d66395e3feee2029ea1c3140b4d3939e7
Reviewed-on: https://go-review.googlesource.com/c/net/+/624175
Auto-Submit: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>

README.md

@@ -2,17 +2,15 @@
 
 [![Go Reference](https://pkg.go.dev/badge/golang.org/x/net.svg)](https://pkg.go.dev/golang.org/x/net)
 
-This repository holds supplementary Go networking libraries.
+This repository holds supplementary Go networking packages.
 
-## Download/Install
+## Report Issues / Send Patches
 
-The easiest way to install is to run `go get -u golang.org/x/net`. You can
-also manually git clone the repository to `$GOPATH/src/golang.org/x/net`.
+This repository uses Gerrit for code changes. To learn how to submit changes to
+this repository, see https://go.dev/doc/contribute.
 
-## Report Issues / Send Patches
+The git repository is https://go.googlesource.com/net.
 
-This repository uses Gerrit for code changes. To learn how to submit
-changes to this repository, see https://golang.org/doc/contribute.html.
 The main issue tracker for the net repository is located at
-https://github.com/golang/go/issues. Prefix your issue with "x/net:" in the
+https://go.dev/issues. Prefix your issue with "x/net:" in the
 subject line, so it is easy to find.