doc/go_mem: fix grammar issue
In the passage about buffered channels, remove redundant words and match
the wording of the earlier passage about unbuffered channels.
Change-Id: I35d8a3bf4f176c3f69cf5e6a64595e5d1c23e3a1
GitHub-Last-Rev:
1c4c9390a174d1a66797a025e2fdb0bf56239f48
GitHub-Pull-Request: golang/go#72891
Reviewed-on: https://go-review.googlesource.com/c/go/+/657778
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Keith Randall <khr@golang.org>