Update books

diff --git a/src/doc/book b/src/doc/book
index 036e88a4f135365de85358febe5324976a56030a..ea90bbaf53ba64ef4e2da9ac2352b298aec6bec8 160000 (submodule)
--- a/src/doc/book
+++ b/src/doc/book
@@ -1 +1 @@
-Subproject commit 036e88a4f135365de85358febe5324976a56030a
+Subproject commit ea90bbaf53ba64ef4e2da9ac2352b298aec6bec8

diff --git a/src/doc/embedded-book b/src/doc/embedded-book
index d5fc1bce3f8eb398f9c25f1b15e0257d7537cd41..a6de8b6e3ea5d4f0de8b7b9a7e5c1405dc2c2ddb 160000 (submodule)
--- a/src/doc/embedded-book
+++ b/src/doc/embedded-book
@@ -1 +1 @@
-Subproject commit d5fc1bce3f8eb398f9c25f1b15e0257d7537cd41
+Subproject commit a6de8b6e3ea5d4f0de8b7b9a7e5c1405dc2c2ddb

diff --git a/src/doc/nomicon b/src/doc/nomicon
index f6d6126fc96ecf4a7f7d22da330df9506293b0d0..11f1165e8a2f5840467e748c8108dc53c948ee9a 160000 (submodule)
--- a/src/doc/nomicon
+++ b/src/doc/nomicon
@@ -1 +1 @@
-Subproject commit f6d6126fc96ecf4a7f7d22da330df9506293b0d0
+Subproject commit 11f1165e8a2f5840467e748c8108dc53c948ee9a

diff --git a/src/doc/reference b/src/doc/reference
index 0a2fe6651fbccc6416c5110fdf5b93fb3cb29247..c97d14fa6fed0baa9255432b8a93cb70614f80e3 160000 (submodule)
--- a/src/doc/reference
+++ b/src/doc/reference
@@ -1 +1 @@
-Subproject commit 0a2fe6651fbccc6416c5110fdf5b93fb3cb29247
+Subproject commit c97d14fa6fed0baa9255432b8a93cb70614f80e3

diff --git a/src/doc/rust-by-example b/src/doc/rust-by-example
index d504324f1e7dc7edb918ac39baae69f1f1513b8e..ec954f35eedf592cd173b21c05a7f80a65b61d8a 160000 (submodule)
--- a/src/doc/rust-by-example
+++ b/src/doc/rust-by-example
@@ -1 +1 @@
-Subproject commit d504324f1e7dc7edb918ac39baae69f1f1513b8e
+Subproject commit ec954f35eedf592cd173b21c05a7f80a65b61d8a

diff --git a/src/doc/rustc-dev-guide b/src/doc/rustc-dev-guide
index 0e4b961a9c708647bca231430ce1b199993e0196..155126b1d2e2cb01ddb1d7ba9489b90d7cd173ad 160000 (submodule)
--- a/src/doc/rustc-dev-guide
+++ b/src/doc/rustc-dev-guide
@@ -1 +1 @@
-Subproject commit 0e4b961a9c708647bca231430ce1b199993e0196
+Subproject commit 155126b1d2e2cb01ddb1d7ba9489b90d7cd173ad