update setup-envtest docs

Signed-off-by: Troy Connor <[email protected]>

Author: troy0820

tools/setup-envtest/README.md

@@ -4,11 +4,14 @@ This is a small tool that manages binaries for envtest. It can be used to
 download new binaries, list currently installed and available ones, and
 clean up versions.
 
-To use it, just go-install it with Golang 1.24+ (it's a separate, self-contained
-module):
+To use it, download the binary from the [release page.](https://github.com/kubernetes-sigs/controller-runtime/releases)
+
+If you want to install this with Golang, you can install a release by using a release branch instead.
+
+NOTE: Each release branch may prefer a different version of Golang when installing.
 
 ```shell
-go install sigs.k8s.io/controller-runtime/tools/setup-envtest@latest
+go install sigs.k8s.io/controller-runtime/tools/setup-envtest@release-0.22
 ```
 
 If you are using Golang 1.23, use the `release-0.20` branch instead: