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

Update HCI command definitions (from 7.8 "LE Controller Commands")
to include:
- A core spec section reference
- The HCI command name itself (e.g., "HCI_LE_Set_PHY")
- Some commands 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/+/149110

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 68dc3812cbcce9e..99f7b09c63bd9e8
Roller-URL: https://ci.chromium.org/b/8779648596974373905
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: If11682213a3616f0771e8cf327bc9aa302f0ab46
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/149472
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 68dc381..99f7b09 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 68dc3812cbcce9e5c786d84b970ef27500bb9804
+Subproject commit 99f7b09c63bd9e80fef7a9282e1acc579c356ede