Update quickstart.md (#6732)

v4-alpha doesnt exist

Signed-off-by: Michael Freeman <mfreeman451@gmail.com>

Author: mfreeman451

website/content/en/docs/building-operators/golang/quickstart.md

@@ -28,8 +28,8 @@ This guide walks through an example of building a simple memcached-operator usin
   operator-sdk init --domain example.com --repo github.com/example/memcached-operator
   ```
 
-**Note** If your local environment is Apple Silicon (`darwin/arm64`) use the `go/v4-alpha`
-plugin which provides support for this platform by adding to the init subCommand the flag `--plugins=go/v4-alpha`
+**Note** If your local environment is Apple Silicon (`darwin/arm64`) use the `go/v4`
+plugin which provides support for this platform by adding to the init subCommand the flag `--plugins=go/v4`
 
 1. Create a simple Memcached API: