roll: third_party/pigweed f45f0c7..99a1be7 (3 commits)

99a1be7:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/316453 doxygen: Migrate pw_string
6d939d5:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/316373 doxygen: Migrate pw_stream
78fce81:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/311136 docs: Fix Sense automation page

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: f45f0c728d9f2d..99a1be794c0fd8
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8705352479111368881
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I7fa8d49325ccfd50e42a432c035ffb88ea24f49d
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/316673
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 f45f0c7..99a1be7 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit f45f0c728d9f2d5675f2e5fae5b054ecb5091921
+Subproject commit 99a1be794c0fd842c3d7319a2aa921faa1996648