Update books for next release

Mark-Simulacrum · Mark-Simulacrum · commit fe8e0d98f17c · 2018-02-09T11:27:47.000-07:00
diff --git a/src/doc/book b/src/doc/book
@@ -1 +1 @@
-Subproject commit a645960fe48946153936dd5628df4a90bd837981
+Subproject commit ec5660820dea91df470dab0b9eb26ef798f20889
diff --git a/src/doc/nomicon b/src/doc/nomicon
@@ -1 +1 @@
-Subproject commit fec3182d0b0a3cf8122e192b3270064a5b19be5b
+Subproject commit ad5ddd62c098d5b424151beda574ae7df2154df1
diff --git a/src/doc/reference b/src/doc/reference
@@ -1 +1 @@
-Subproject commit e6a5d5d10aa2fde0baed7b29bf672bd9f3af8962
+Subproject commit 254df654a9b75abf6ca08806535dbe1fad41be3f
diff --git a/src/doc/rust-by-example b/src/doc/rust-by-example
@@ -1 +1 @@
-Subproject commit 4ebb8169dfe569b3dcbeab560607800bb717978a
+Subproject commit 919980be7df4ea7d45a9dca8efc34da89bcf7d6b
