[roll pigweed] pw_env_setup: Fix outdated docstring

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/107840

https://pigweed.googlesource.com/pigweed/pigweed
pigweed Rolled-Commits: ecbee8d9aeb5910..57456a4254640a7
Roller-URL: https://ci.chromium.org/b/8805103354673495089
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I8c82b75b78dcc67238588cc49862560750c265c5
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/zephyr-integration/+/107845
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/pigweed b/pigweed
index ecbee8d..57456a4 160000
--- a/pigweed
+++ b/pigweed
@@ -1 +1 @@
-Subproject commit ecbee8d9aeb5910bd8b309e2e29c5699c4290311
+Subproject commit 57456a4254640a7978fe8921084f070f20c607f8