[third_party/pigweed] Roll 2 commits

517696e29810c51 docs: Mention that Windows flow needs admin rights
849d99bd97a5613 pw_presubmit: Include examples repo docs in docs_b

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 3f89c18fdffd43f..517696e29810c51
Roller-URL: https://ci.chromium.org/b/8751540656879868001
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: If06cb848f2617d125fce0fcc48aea611aa21a7c2
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/quickstart/bazel/+/201977
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 3f89c18..517696e 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 3f89c18fdffd43f6838307fa5fa8c9900c7b4071
+Subproject commit 517696e29810c51426a1e6f3438ad7df2580bc74