doc/go1.18: drop misplaced period
doc/go1.18: drop misplaced period

Change-Id: Id29f352c8d2e61672f55294120058b1f585f7aeb
Reviewed-on: https://go-review.googlesource.com/c/go/+/387655
Trust: Michael Pratt <e7f1edc6d5aa9f6c8c377425db8f1a5816cbbb88@google.com>
Run-TryBot: Michael Pratt <e7f1edc6d5aa9f6c8c377425db8f1a5816cbbb88@google.com>
Reviewed-by: Jeremy Faller <b3f594e10a9edcf5413cf1190121d45078c62290@golang.org>
TryBot-Result: Gopher Robot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

CAFxX/go,cloudflare/go,nawawi/go,CAFxX/go,cloudflare/go,golang/go,CAFxX/go,nawawi/go,golang/go,golang/go,cloudflare/go,golang/go,nawawi/go,cloudflare/go,golang/go,nawawi/go,cloudflare/go,CAFxX/go,golang/go,CAFxX/go,nawawi/go,cloudflare/go,golang/go,nawawi/go,golang/go,CAFxX/go,CAFxX/go,nawawi/go,cloudflare/go,nawawi/go,cloudflare/go,CAFxX/go