Merge branch 'v1.2' into v1.3

Author: jmikola

docs/includes/apiargs-MongoDBDatabase-method-createCollection-option.yaml

@@ -138,7 +138,7 @@ post: |
 ---
 arg_name: option
 name: validator
-type: array
+type: array|object
 description: |
   Allows users to specify :manual:`validation rules or expressions
   </core/document-validation>` for the collection. For more information, see