spec: explicitly state the import path for package unsafe
spec: explicitly state the import path for package unsafe

Nowhere in the spec did we mention the import path for package
unsafe. Now we do.

Fixes #22308.

Change-Id: Ifd42c873188e898c597cdee4284e7a9d234a9282
Reviewed-on: https://go-review.googlesource.com/71373
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
Reviewed-by: Rob Pike <4dc7c9ec434ed06502767136789763ec11d2c4b7@golang.org>
Reviewed-by: Matthew Dempsky <e56ac2c500064424afac424d4b5e53bd0570a731@google.com>

akutz/go,Cofyc/go,akutz/go,codestation/go,josharian/go,nawawi/go,josharian/go,cloudflare/go,golang/go,Cofyc/go,nawawi/go,golang/go,cloudflare/go,CAFxX/go,Cofyc/go,josharian/go,cloudflare/go,cloudflare/go,nawawi/go,nawawi/go,josharian/go,codestation/go,nawawi/go,Cofyc/go,akutz/go,akutz/go,cloudflare/go,CAFxX/go,akutz/go,josharian/go,nawawi/go,CAFxX/go,golang/go,codestation/go,cloudflare/go,CAFxX/go,josharian/go,codestation/go,codestation/go,codestation/go,Cofyc/go,akutz/go,Cofyc/go,nawawi/go,Cofyc/go,josharian/go,golang/go,golang/go,codestation/go,christopher-henderson/Go,josharian/go,CAFxX/go,codestation/go,nawawi/go,Cofyc/go,CAFxX/go,golang/go,CAFxX/go,golang/go,cloudflare/go,golang/go,CAFxX/go,akutz/go,cloudflare/go,akutz/go