[roll third_party/pigweed] docs: Move commit guide to style guide

Moves the commit message style details into the style guide, and also
adds the new visual red/green callouts.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/99401

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 437727bd2baa87e..522e55dae4bfbed
Roller-URL: https://ci.chromium.org/b/8810547750642031009
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8810547750642031009
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I45681763c624e4d866e15cfecea1cc77e0d63a4e
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/99525
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 437727b..522e55d 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 437727bd2baa87ea2c8057b70fecfdafb4a00f43
+Subproject commit 522e55dae4bfbed7727a1601bef8e94d5d59dc34