Merge v1.17 into v1.18 (#1315)

Author: alcaeus

docs/tutorial/decimal128.txt

@@ -13,8 +13,8 @@ Decimal128
 Overview
 --------
 
-MongoDB 3.4 introduced support for a :manual:`Decimal128 BSON type
-</release-notes/3.4/#decimal-type>`, which is a 128-bit decimal-based
+MongoDB 3.4 introduced support for a Decimal128 BSON type,
+which is a 128-bit decimal-based
 floating-point value capable of emulating decimal rounding with exact precision.
 This functionality is intended for applications that handle :manual:`monetary
 data </tutorial/model-monetary-data>`, such as financial and tax computations.