go/ast: document invalid raw string literal end position containing carriage returns
Fixes #69861
Change-Id: Id1684ee7d0c04262119d9e61f914bb9ecc0ef438
GitHub-Last-Rev:
5ad182c51aeb8b26631c6a97a7e9a2d89405ec06
GitHub-Pull-Request: golang/go#69862
Reviewed-on: https://go-review.googlesource.com/c/go/+/619835
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Alan Donovan <adonovan@google.com>