README.md: fix GoDoc badge source
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# Google Cloud Client Libraries for Go
-[![GoDoc](https://pkg.go.dev/cloud.google.com/go?status.svg)](https://pkg.go.dev/cloud.google.com/go)
+[![GoDoc](https://godoc.org/cloud.google.com/go?status.svg)](https://pkg.go.dev/cloud.google.com/go)
Go packages for [Google Cloud Platform](https://cloud.google.com) services.