[roll third_party/pigweed] docs: Update changelog

Original-Bug: b/292247409
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/177085

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 355da0574a171fa..f8ab5df218cd027
Roller-URL: https://ci.chromium.org/b/8766680878599561937
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I42cda0937b0cb1564224bfdf9ff1809ac89dd427
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/kudzu/+/177174
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 355da05..f8ab5df 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 355da0574a171fafedcb3e04c4b3dcee6ef53124
+Subproject commit f8ab5df218cd027681b86058c4e86d6c8f23f1a1