spec: provide some (minimal) intuition for the notion of "terminating statement"
spec: provide some (minimal) intuition for the notion of "terminating statement"

Fixes #23215.

Change-Id: Ib20825bf08915b4daaabbfd91f168e24973c512d
Reviewed-on: https://go-review.googlesource.com/85215
Reviewed-by: Rob Pike <4dc7c9ec434ed06502767136789763ec11d2c4b7@golang.org>

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