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

Roller-URL: https://ci.chromium.org/b/8747966816340737825
CQ-Do-Not-Cancel-Tryjobs: true
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1047832
Original-Revision: d85a812c0759bf80a6bab9289d2c6fb9e2d19415
GitOrigin-RevId: 2b037f0eef05b4b25a2e651c394019a07a452d80
Change-Id: I240765ca101856ee4ae6a1f859ccf59fd084abe9
diff --git a/stem b/stem
index b392cb8..8817dd1 100644
--- a/stem
+++ b/stem
@@ -11,7 +11,7 @@
              githooks="integration/git-hooks"
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="82b7bba7af7a63ece7ba1d95002e9c7eb6fbebdf"/>
+             revision="d85a812c0759bf80a6bab9289d2c6fb9e2d19415"/>
   </projects>
   <hooks>
     <hook name="install-environment"