update books for new release

[rust.git] / src / doc / reference

diff --git a/src/doc/reference b/src/doc/reference
index 0f63519ea10c028f48b2dbf7d0a2454203b68b0b..219e261ddb833a5683627b0a9be87a0f4486abb9 160000 (submodule)
--- a/src/doc/reference
+++ b/src/doc/reference
@@ -1 +1 @@
-Subproject commit 0f63519ea10c028f48b2dbf7d0a2454203b68b0b
+Subproject commit 219e261ddb833a5683627b0a9be87a0f4486abb9