Bump book and reference.

frewsxcv · frewsxcv · commit 19851f49791a · 2017-04-18T19:50:19.000-04:00
diff --git a/src/doc/book b/src/doc/book
@@ -1 +1 @@
-Subproject commit beea82b9230cd641dd1ca263cf31025ace4aebb5
+Subproject commit ad7de198561b3a12217ea2da76d796d9c7fc0ed3
diff --git a/src/doc/reference b/src/doc/reference
@@ -1 +1 @@
-Subproject commit b060f732145f2fa16df84c74e511df08a3a47c5d
+Subproject commit 6b0de90d87dda15e323ef24cdf7ed873ac5cf4d3
