[roll third_party/pigweed] pw_web: Add manual testing page in docs

Original-Bug: 288587657

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/178923

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 4e8c2e22d497e72..87636efd044bee2
Roller-URL: https://ci.chromium.org/b/8764969032326390545
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I6fce895fac08d357be2064ee72fce20d95522f36
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/179855
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 4e8c2e2..87636ef 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 4e8c2e22d497e72c625f12c64633a1d4b963fc78
+Subproject commit 87636efd044bee24f360c979153abc7df28a7690