[gndoc] Update GN build arguments documentation

Roller-URL: https://cr-buildbucket.appspot.com/build/8722867979504016337
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I8d14f30102e40e5183a032ddfed2f8c45d156816
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1207392
Commit-Queue: Docs Roller <[email protected]>

Author: docs-roller

docs/gen/build_arguments.md

@@ -731,23 +731,23 @@ From //build/info/info.gni:10
 Logical version of the current build. If not set, defaults to the timestamp
 of the most recent update.
 
-**Current value for `target_cpu = "arm64"`:** `"8722913285554554625"`
+**Current value for `target_cpu = "arm64"`:** `"8722867979504016337"`
 
 From //out/not-default/args.gn:10
 
 **Overridden from the default:** `""`
 
 From //build/info/info.gni:17
 
-**Current value for `target_cpu = "riscv64"`:** `"8722913285554554625"`
+**Current value for `target_cpu = "riscv64"`:** `"8722867979504016337"`
 
 From //out/not-default/args.gn:10
 
 **Overridden from the default:** `""`
 
 From //build/info/info.gni:17
 
-**Current value for `target_cpu = "x64"`:** `"8722913285554554625"`
+**Current value for `target_cpu = "x64"`:** `"8722867979504016337"`
 
 From //out/not-default/args.gn:10