small fixes

Author: rustagir

source/tutorials/aggregation.txt

@@ -7,14 +7,14 @@ Aggregation Framework
 .. contents:: On this page
    :local:
    :backlinks: none
-   :depth: 1
+   :depth: 2
    :class: singlecol
 
 The aggregation pipeline is a framework for data aggregation,
 modeled on the concept of data processing pipelines.
 
 To learn more about aggregation, see :manual:`Aggregation Pipeline
-</core/aggregation-pipeline/>`.
+</core/aggregation-pipeline/>` in the Server manual.
 
 Prerequisites
 -------------