Update books

diff --git a/src/doc/book b/src/doc/book
index c8841f2841a2d26124319ddadd1b6a245f9a1856..f5db319e0b19c22964398d56bc63103d669e1bba 160000 (submodule)
--- a/src/doc/book
+++ b/src/doc/book
@@ -1 +1 @@
-Subproject commit c8841f2841a2d26124319ddadd1b6a245f9a1856
+Subproject commit f5db319e0b19c22964398d56bc63103d669e1bba

diff --git a/src/doc/edition-guide b/src/doc/edition-guide
index 37f9e6848411188a1062ead1bd8ebe4b8aa16899..8204c1d123472cd17f0c1c5c77300ae802eb0271 160000 (submodule)
--- a/src/doc/edition-guide
+++ b/src/doc/edition-guide
@@ -1 +1 @@
-Subproject commit 37f9e6848411188a1062ead1bd8ebe4b8aa16899
+Subproject commit 8204c1d123472cd17f0c1c5c77300ae802eb0271

diff --git a/src/doc/embedded-book b/src/doc/embedded-book
index d22a9c487c78095afc4584f1d9b4ec43529d713c..668fb07b6160b9c468f598e839c1e044db65de30 160000 (submodule)
--- a/src/doc/embedded-book
+++ b/src/doc/embedded-book
@@ -1 +1 @@
-Subproject commit d22a9c487c78095afc4584f1d9b4ec43529d713c
+Subproject commit 668fb07b6160b9c468f598e839c1e044db65de30

diff --git a/src/doc/reference b/src/doc/reference
index 89dd146154474559536d5d4049a03831c501deea..3ce94caed4cf967106c51ae86be5e098f7875f11 160000 (submodule)
--- a/src/doc/reference
+++ b/src/doc/reference
@@ -1 +1 @@
-Subproject commit 89dd146154474559536d5d4049a03831c501deea
+Subproject commit 3ce94caed4cf967106c51ae86be5e098f7875f11

diff --git a/src/doc/rust-by-example b/src/doc/rust-by-example
index a6638463efc7631bc0e8dc67ccd256d4e1b61f1a..c106d1683c3a2b0960f0f0fb01728cbb19807332 160000 (submodule)
--- a/src/doc/rust-by-example
+++ b/src/doc/rust-by-example
@@ -1 +1 @@
-Subproject commit a6638463efc7631bc0e8dc67ccd256d4e1b61f1a
+Subproject commit c106d1683c3a2b0960f0f0fb01728cbb19807332