Update books

ehuss · ehuss · commit 194de274d322 · 2020-03-16T19:09:54.000-07:00
diff --git a/src/doc/embedded-book b/src/doc/embedded-book
@@ -1 +1 @@
-Subproject commit b81ffb7a6f4c5aaed92786e770e99db116aa4ebd
+Subproject commit d22a9c487c78095afc4584f1d9b4ec43529d713c
diff --git a/src/doc/reference b/src/doc/reference
@@ -1 +1 @@
-Subproject commit 559e09caa9661043744cf7af7bd88432d966f743
+Subproject commit e2f11fe4d6a5ecb471c70323197da43c70cb96b6
diff --git a/src/doc/rust-by-example b/src/doc/rust-by-example
@@ -1 +1 @@
-Subproject commit db57f899ea2a56a544c8d280cbf033438666273d
+Subproject commit cb369ae95ca36b841960182d26f6d5d9b2e3cc18
