[roll third_party/pigweed] pw_tokenizer: Mention GCC template bug in the docs

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/189820

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 88a609196fd8cb5..c692387895636a8
Roller-URL: https://ci.chromium.org/b/8757355782156491505
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ib6c5877158dcf7e42f3dfeb7899a49264b2c9e1f
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/189840
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 88a6091..c692387 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 88a609196fd8cb5c0c5937cd00175ccf8dd87ba8
+Subproject commit c692387895636a85029f342e457eb710fb478fdd