[roll third_party/pigweed] pw_stream: Minor comment cleanup

Minor comment fix

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/60024

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 64496a454367124..16dcfa005c26c40
Roller-URL: https://ci.chromium.org/b/8836641125984208257
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8836641125984208257
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I28697046832c479946fef0caf10b2d04fb03b61d
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/60140
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 64496a4..16dcfa0 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 64496a454367124e46f716595eeb1af046a8c725
+Subproject commit 16dcfa005c26c40f1da520914c6a3ab447a70ea3