[roll third_party/pigweed] pw_protobuf: Tweak documentation of name conflicts

Rearrange and reword part of the "Reserved-Word Conflicts" section of
docs.rst for better clarity and readability.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/99004

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 922a15193083758..a44a70a1bd3351b
Roller-URL: https://ci.chromium.org/b/8810618451059152065
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8810618451059152065
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I6dcc60f8acc0fe9e26f136ee754d38f9cf5ec6bc
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/99481
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 922a151..a44a70a 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 922a15193083758fdc998aafc7dcfbf584cc5ba1
+Subproject commit a44a70a1bd3351be7809292bafbf6933c8363767