[roll third_party/pigweed] pw_presubmit: Include examples repo docs in docs_builder

Original-Bug: 300317433
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/201990

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 3f89c18fdffd43f..849d99bd97a5613
Roller-URL: https://ci.chromium.org/b/8751544520101443249
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Idee39e71805ff120f13d6cd2bf787cae020bc463
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/202012
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 3f89c18..849d99b 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 3f89c18fdffd43f6838307fa5fa8c9900c7b4071
+Subproject commit 849d99bd97a561308a17e2f7f29c9ab46ce8acd2