[roll third_party/pigweed] docs: Fix typo in pw_docgen

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/54040

third_party/pigweed Rolled-Commits: f7376c9fc562209..d53535956d3e96c
Roller-URL: https://ci.chromium.org/b/8840988715389653168
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8840988715389653168
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ia4ac0e6efb3b766ac04d1be56249bfc449994d3c
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/53868
Reviewed-by: 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 f7376c9..d535359 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit f7376c9fc5622091b82f28920f8662cae2292f9a
+Subproject commit d53535956d3e96c258d53b77d7138de17d336774