doc/go1.18: note changes to automatic go.mod and go.sum updates
doc/go1.18: note changes to automatic go.mod and go.sum updates

Fixes #51242
Updates #45551

Change-Id: Iba6e6acd9a94d24e26fcdd125f1022430723ada7
Reviewed-on: https://go-review.googlesource.com/c/go/+/387920
Trust: Dmitri Shuralyov <d181b7fea0ec87c86ba5a890ab716db52498e3ba@golang.org>
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
Trust: Bryan Mills <1c8aad60184261ccede67f5c63a0d2a3bf3c9ff4@google.com>

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