roll: third_party/pigweed docs: Remove borders from inline code

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/236876
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Original-Revision: fd5c648a333b9ea5b74a72b7324b8ea44535ed3a

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 213b6e1e533e64..fd5c648a333b9e
Roller-URL: https://ci.chromium.org/b/8736325182992177585
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ie0b556996fec88d8fb5186d0ad3ae43c3307573b
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/236768
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diff --git a/third_party/pigweed b/third_party/pigweed
index 213b6e1..fd5c648 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 213b6e1e533e64bca8872166ea6ccfaa8997c282
+Subproject commit fd5c648a333b9ea5b74a72b7324b8ea44535ed3a