roll: third_party/pigweed: docs: Update changelog

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/222831
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https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 990ed9bb2f16bec..a27a7371c69cb58
Roller-URL: https://ci.chromium.org/b/8742574042704809217
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ibe15fb2a18b0f0e4515e8e74a7ec5d5bc104ddd0
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/222644
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
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diff --git a/third_party/pigweed b/third_party/pigweed
index 990ed9b..a27a737 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 990ed9bb2f16bec98ee00a6ae5748ad9106c724e
+Subproject commit a27a7371c69cb5820803be9ce842dd7242fb675a