[wip] bump src/doc/book submodule for testing

chriskrycho · chriskrycho · commit 8dce5530becb · 2024-10-25T17:13:35.000-06:00
diff --git a/src/doc/book b/src/doc/book
@@ -1 +1 @@
-Subproject commit 9b812c6278a1fe119ca243d5221a6d305a3a1e43
+Subproject commit be84fe8322c87406983cfa579ecce272ef55c0d2
