[roll third_party/pigweed] docs: Update homepage

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/190018

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 2459ff43134cdf9..b087ad070626ad9
Roller-URL: https://ci.chromium.org/b/8757240071260271537
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I7fabedddaee6cd04d7c53b80e2b5b6e4dd1c7009
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/190146
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 2459ff4..b087ad0 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 2459ff43134cdf924516be0f791f070c57befcd7
+Subproject commit b087ad070626ad910e8095c877069107aec75b92