[roll third_party/pigweed] pw_spi: Spelling error fixes to docs and comments

Only spelling error fixes in the docs and code comments. No
code changes at all.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/110470

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: d910aa4f7d1d9bb..161644d11db9c2d
Roller-URL: https://ci.chromium.org/b/8802858356046362033
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ic8aebe3695f4cdad8f448bdc75f65e857e6eb31e
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/110593
Bot-Commit: 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 d910aa4..161644d 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit d910aa4f7d1d9bb3bf54e11f820b6320ca2b3b4d
+Subproject commit 161644d11db9c2dad33142609b35cd0d5cb71bfb