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

Roller-URL: https://ci.chromium.org/b/8820727932470243249
Cq-Cl-Tag: roller-builder:fuchsia-docs-roller
Cq-Cl-Tag: roller-bid:8820727932470243249
CQ-Do-Not-Cancel-Tryjobs: true
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/652350
Original-Revision: e7f0f242d1fd642c33be5e37c7e56d02f18dec83
GitOrigin-RevId: 7a45a49b94a845807033570feadd9b385bf07f5c
Change-Id: I5ca1ffec5d9b73c08fd8b76176175e7ba31aca45
diff --git a/stem b/stem
index 299ca29..d43b647 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
              githooks=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="f2bfe01c5221517d3cf7e65a98707d58b02710f2"/>
+             revision="e7f0f242d1fd642c33be5e37c7e56d02f18dec83"/>
   </projects>
   <hooks>
     <hook name="install-environment"