[roll third_party/pigweed] docs: fix typo

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/48320

third_party/pigweed Rolled-Commits: 0d4c9169cda2f4a..f5d7ae3705509bc
Roller-URL: https://ci.chromium.org/b/8844966890060113425
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8844966890060113425
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ib1699b0aa7fd1d0b8b2c0f04a27536f381b580f1
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/48346
Reviewed-by: 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 0d4c916..f5d7ae3 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 0d4c9169cda2f4af2b6a7a09197cbe7fc604d713
+Subproject commit f5d7ae3705509bc87cb646c5a5c51b515d2bc557