[roll pigweed] pw_sync_freertos: Update InterruptSpinLock docs

Small update for InterruptSpinLock clarifying that InterruptSpinLock
cannot be used in interrupts with priority above
configMAX_SYSCALL_INTERRUPT_PRIORITY.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/108091

https://pigweed.googlesource.com/pigweed/pigweed
pigweed Rolled-Commits: 050540515c8067c..366513d44688d64
Roller-URL: https://ci.chromium.org/b/8804906897707719521
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ia93edc2153bc466d9aa216d186865b06c943d2f5
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/zephyr-integration/+/108134
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/pigweed b/pigweed
index 0505405..366513d 160000
--- a/pigweed
+++ b/pigweed
@@ -1 +1 @@
-Subproject commit 050540515c8067c8a25e5490e5aed2edaec58f43
+Subproject commit 366513d44688d6441524b2659b2769a14079df2c