[roll third_party/pigweed] pw_format: Correct crate name in docs

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/178078

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 3652215bacf5393..f50e8aa47fdcf24
Roller-URL: https://ci.chromium.org/b/8766060302172267425
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ice87c03dba455e341cd8177947fc1cf0df3f6d72
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/177918
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 3652215..f50e8aa 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 3652215bacf5393341805d88b2d7bbdf4cd0d6f0
+Subproject commit f50e8aa47fdcf242373a7205af1cebff85ffaa79