sumdb/note: fix some typos
sumdb/note: fix some typos

Change-Id: I5892e2a3bb32c70ea585987d70d02d95723eb9a7
GitHub-Last-Rev: 0991638c7a3c74909ecc0b6ccc8f47cc6a1c2467
GitHub-Pull-Request: golang/mod#11
Reviewed-on: https://go-review.googlesource.com/c/mod/+/428575
Run-TryBot: Bryan Mills <1c8aad60184261ccede67f5c63a0d2a3bf3c9ff4@google.com>
TryBot-Result: Gopher Robot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Auto-Submit: Bryan Mills <1c8aad60184261ccede67f5c63a0d2a3bf3c9ff4@google.com>
Reviewed-by: Michael Knyszek <4473450dc5c88f06e1fb787f303d7805ec2aee65@google.com>
Reviewed-by: Bryan Mills <1c8aad60184261ccede67f5c63a0d2a3bf3c9ff4@google.com>

golang/mod,golang/mod