[roll third_party/pigweed] pw_bluetooth: Update comments in HCI event defs

Update HCI event definitions (from 7.7 "Events") to include:
- A core spec section reference
- The HCI event name itself (e.g., "HCI_Inquiry_Complete")
- Some events we haven't implemented (as TODOs)

Original-Bug: b/265052417
Test: No pigweed regressions, all Sapphire bt-host tests pass.
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/174070

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 272e12409b28ca9..b39ca9212a85e18
Roller-URL: https://ci.chromium.org/b/8768233005743629473
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: If55b23e28b93bcc9be8f4403e57ca93caa31a18c
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/174039
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/third_party/pigweed b/third_party/pigweed
index 272e124..b39ca92 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 272e12409b28ca93cffb469c0ad058db1f711779
+Subproject commit b39ca9212a85e181f6b50947e0688efa982c8264