update books for new release

diff --git a/src/doc/book b/src/doc/book
index f475da63a18d50217459a601cbef69a4bcac5e71..88cdde350fd3a90c93f3bac8b4f168f105d28060 160000 (submodule)
--- a/src/doc/book
+++ b/src/doc/book
@@ -1 +1 @@
-Subproject commit f475da63a18d50217459a601cbef69a4bcac5e71
+Subproject commit 88cdde350fd3a90c93f3bac8b4f168f105d28060

diff --git a/src/doc/nomicon b/src/doc/nomicon
index 66ef7373409d1979c2839db8886ac2ec9b6a58cd..790e96b87f4b5817cac310e73a524d25c3d076d8 160000 (submodule)
--- a/src/doc/nomicon
+++ b/src/doc/nomicon
@@ -1 +1 @@
-Subproject commit 66ef7373409d1979c2839db8886ac2ec9b6a58cd
+Subproject commit 790e96b87f4b5817cac310e73a524d25c3d076d8

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

diff --git a/src/doc/rust-by-example b/src/doc/rust-by-example
index d2a64395a5210a61d3512a3a5c615f5c47699443..e3719fc78ff4a21dfd13cfcc9e2ca42cb5de29f4 160000 (submodule)
--- a/src/doc/rust-by-example
+++ b/src/doc/rust-by-example
@@ -1 +1 @@
-Subproject commit d2a64395a5210a61d3512a3a5c615f5c47699443
+Subproject commit e3719fc78ff4a21dfd13cfcc9e2ca42cb5de29f4