roll: third_party/pigweed docs: Automate changelog

Original-Bug: 447633516

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/306434
Presubmit-Verified: CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com>
Original-Revision: 508ea4e12a3ca06b50f3feff0edab1c59a745856

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: cd66c2ae843609..508ea4e12a3ca0
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8698119256176971857
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I002adf87b9c57dc64df2ee857b9fea0a526383f1
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/344972
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
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 cd66c2a..508ea4e 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit cd66c2ae843609bf86b1964329b098cb70154cac
+Subproject commit 508ea4e12a3ca06b50f3feff0edab1c59a745856