roll: pigweed pw_thread: Comment / docs updates

- Discourage use of ThreadCore in new code, since threads are now
  constructed from pw::Function<void()>.
- Remove references to default-constructed Options, since that is not
  supported.
- Formatting updates.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/236795
Presubmit-Verified: CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com>
Original-Revision: 25c8b842ecfa6d530b785d61c1fab105b352bcdd

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: f1f654a15a3adc..25c8b842ecfa6d
Roller-URL: https://ci.chromium.org/b/8736423531448244305
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I129877bfc631f28714b4e520a7566b42d4c2f793
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/quickstart/bazel/+/236780
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/MODULE.bazel b/MODULE.bazel
index dcb087a..18b0817 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -49,8 +49,8 @@
     module_name = "pigweed",
     # ROLL: Warning: this entry is automatically updated.
     # ROLL: Last updated 2024-09-18.
-    # ROLL: By https://cr-buildbucket.appspot.com/build/8736430634307278097.
-    commit = "f1f654a15a3adce476c2d68643eee56f3c225dd4",
+    # ROLL: By https://cr-buildbucket.appspot.com/build/8736423531448244305.
+    commit = "25c8b842ecfa6d530b785d61c1fab105b352bcdd",
     remote = "https://pigweed.googlesource.com/pigweed/pigweed",
 )
 
@@ -58,8 +58,8 @@
     module_name = "pw_toolchain",
     # ROLL: Warning: this entry is automatically updated.
     # ROLL: Last updated 2024-09-18.
-    # ROLL: By https://cr-buildbucket.appspot.com/build/8736430634307278097.
-    commit = "f1f654a15a3adce476c2d68643eee56f3c225dd4",
+    # ROLL: By https://cr-buildbucket.appspot.com/build/8736423531448244305.
+    commit = "25c8b842ecfa6d530b785d61c1fab105b352bcdd",
     remote = "https://pigweed.googlesource.com/pigweed/pigweed",
     strip_prefix = "pw_toolchain_bazel",
 )