update rust book

kadiwa4 · kadiwa4 · commit 0d99f1d09f48 · 2023-08-04T18:40:55.000+02:00
diff --git a/src/doc/book b/src/doc/book
@@ -1 +1 @@
-Subproject commit 668c64760b5c7ea654facb4ba5fe9faddfda27cc
+Subproject commit 72187f5cd0beaaa9c6f584156bcd88f921871e83
