[roll third_party/pigweed] docs: Fix typo in facades documentation

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/192710

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: e3ac615f170f5ec..9ba0e2a6c10e318
Roller-URL: https://ci.chromium.org/b/8756010098681737185
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: If04668381b6aec626f5fb6bad147baa400ba5700
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/192752
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 e3ac615..9ba0e2a 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit e3ac615f170f5ec93f3f486f6bdf03160f010a94
+Subproject commit 9ba0e2a6c10e31870210fba66c71ca57e85f7982