[roll third_party/pigweed] pw_containers: Doxygenify pw::containers::FilteredView

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/160373

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: decf14dbacac80d..28b70a038345ba9
Roller-URL: https://ci.chromium.org/b/8774310743086909713
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ic4f7aa45e3ff237f945161946cf5cf6c77808829
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/160756
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 decf14d..28b70a0 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit decf14dbacac80d8c0cddc9193f78a77f4ff0ae2
+Subproject commit 28b70a038345ba9a3273f18705ab628e161822a7