[roll] Roll fuchsia [gndoc] Update GN build arguments documentation

Roller-URL: https://ci.chromium.org/b/8865555972171554592
Cq-Cl-Tag: roller-builder:fuchsia-docs-roller
Cq-Cl-Tag: roller-bid:8865555972171554592
CQ-Do-Not-Cancel-Tryjobs: true
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/442779
Original-Revision: 8e02bd230639089385a2ead5b28e3ee2a8fcf1e2
GitOrigin-RevId: 69e6b7f8f50d23661a5b97c22d5224aac111f97b
Change-Id: I594e1c503cce10828d4183d16813719ec1cf4fc1
diff --git a/stem b/stem
index 06c8ce2..2462fbc 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
              githooks=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="8311bc4024fd8e1d598266b29fafcfe283f3a05e"/>
+             revision="8e02bd230639089385a2ead5b28e3ee2a8fcf1e2"/>
   </projects>
   <hooks>
     <hook name="install-fx"