[roll third_party/pigweed] pw_chrono: Doc example fix

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/59482

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 4a6deb42dde7d4d..8e022781b40229f
Roller-URL: https://ci.chromium.org/b/8837186228581110561
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8837186228581110561
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I0a3f7f1fb8586453feec789dad0b62d7ce687803
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/59501
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 4a6deb4..8e02278 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 4a6deb42dde7d4d8b081bae6c6688d824b960034
+Subproject commit 8e022781b40229fe955eaa69bad87a6ccc8e09ad