roll: third_party/pigweed pw_bluetooth_sapphire: Update docs

Move Fuchsia developer docs to separate page.

Add architecture, features, certification, and products sections.

Original-Bug: b/372483129
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/239497
Original-Revision: 7d78c549c47d4bcd4a726b856013fede6f2ea891

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 6efc99b3ee854d..7d78c549c47d4b
Roller-URL: https://ci.chromium.org/b/8734527648714351009
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I720790acfba9576875114f170461697d527a05f0
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/241047
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 6efc99b..7d78c54 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 6efc99b3ee854dd54a0b1465d9014c54e01b21b9
+Subproject commit 7d78c549c47d4bcd4a726b856013fede6f2ea891