[roll third_party/pigweed] pw_thread: Update Options detached clarification

Update Options comment regarding detached vs joinable to match docs.rst.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/112290

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: a71a40baac64d7d..4523f2b46b7612b
Roller-URL: https://ci.chromium.org/b/8801844696058849025
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I062b07c70ffb658d010d8df5bc477c99009a70f6
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/112256
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 a71a40b..4523f2b 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit a71a40baac64d7d0f2f9c315cd95914a77da9cf4
+Subproject commit 4523f2b46b7612b3a12c68f3ab0fb766f91ca465