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

Roller-URL: https://ci.chromium.org/b/8853438410832278864
Cq-Cl-Tag: roller-builder:fuchsia-docs-roller
Cq-Cl-Tag: roller-bid:8853438410832278864
CQ-Do-Not-Cancel-Tryjobs: true
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/497258
Original-Revision: dd5bad335ca69a544d14e98aca0aab77e033d4d2
GitOrigin-RevId: 2379e6a24aa3751fa63369288e6f2d2bd509dc80
Change-Id: Icb1030995044809f67603ca84b20045e0445bcc7
diff --git a/stem b/stem
index e89b824..ef1376a 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
              githooks=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="f47bb7669d55f3eb32d19d730c1ff14df05df01c"/>
+             revision="dd5bad335ca69a544d14e98aca0aab77e033d4d2"/>
   </projects>
   <hooks>
     <hook name="install-environment"