DOCS-566 qualify titles of aggregation operators with (aggregation)

Also add (projection) to $slice

Author: Ed Costello

source/reference/aggregation.txt

@@ -73,25 +73,25 @@ contains documents that resemble the following:
 The current pipeline operators are:
 
 .. include:: aggregation/project.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/match.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/limit.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/skip.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/unwind.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/group.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/sort.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. _aggregation-expression-operators:
 
@@ -115,13 +115,13 @@ return Booleans as results.
    such as strings, dates, objects become ``true``.
 
 .. include:: aggregation/and.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/or.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/not.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 Comparison Operators
 ~~~~~~~~~~~~~~~~~~~~
@@ -135,62 +135,62 @@ all comparison operators return a Boolean value. :expression:`$cmp`
 returns an integer.
 
 .. include:: aggregation/cmp.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/eq.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/gt.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/gte.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/lt.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/lte.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/ne.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 Arithmetic Operators
 ~~~~~~~~~~~~~~~~~~~~
 
 These operators only support numbers.
 
 .. include:: aggregation/add.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/divide.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/mod.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/multiply.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/subtract.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 String Operators
 ~~~~~~~~~~~~~~~~
 
 These operators manipulate strings within projection expressions.
 
 .. include:: aggregation/strcasecmp.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/substr.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/toLower.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/toUpper.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 Date Operators
 ~~~~~~~~~~~~~~
@@ -199,37 +199,37 @@ All date operators take a "Date" typed value as a single
 argument and return a number.
 
 .. include:: aggregation/dayOfYear.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/dayOfMonth.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/dayOfWeek.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/year.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/month.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/week.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/hour.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/minute.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/second.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 Conditional Expressions
 ~~~~~~~~~~~~~~~~~~~~~~~
 
 .. include:: aggregation/cond.txt
-   :start-after: agg
+   :start-after: default-domain:: agg
 
 .. include:: aggregation/ifNull.txt
-   :start-after: agg
+   :start-after: default-domain:: agg

source/reference/aggregation/add.txt

@@ -1,6 +1,6 @@
-====
-$add
-====
+==================
+$add (aggregation)
+==================
 
 .. default-domain:: agg
 

source/reference/aggregation/addToSet.txt

@@ -1,6 +1,6 @@
-=========
-$addToSet
-=========
+=======================
+$addToSet (aggregation)
+=======================
 
 .. default-domain:: agg
 

source/reference/aggregation/and.txt

@@ -1,6 +1,6 @@
-====
-$and
-====
+==================
+$and (aggregation)
+==================
 
 .. default-domain:: agg
 

source/reference/aggregation/avg.txt

@@ -1,6 +1,6 @@
-====
-$avg
-====
+==================
+$avg (aggregation)
+==================
 
 .. default-domain:: agg
 

source/reference/aggregation/cmp.txt

@@ -1,6 +1,6 @@
-====
-$cmp
-====
+==================
+$cmp (aggregation)
+==================
 
 .. default-domain:: agg
 

source/reference/aggregation/cond.txt

@@ -1,6 +1,6 @@
-=====
-$cond
-=====
+===================
+$cond (aggregation)
+===================
 
 .. default-domain:: agg
 

source/reference/aggregation/dayOfMonth.txt

@@ -1,6 +1,6 @@
-===========
-$dayOfMonth
-===========
+=========================
+$dayOfMonth (aggregation)
+=========================
 
 .. default-domain:: agg
 

source/reference/aggregation/dayOfWeek.txt

@@ -1,6 +1,6 @@
-==========
-$dayOfWeek
-==========
+========================
+$dayOfWeek (aggregation)
+========================
 
 .. default-domain:: agg
 

source/reference/aggregation/dayOfYear.txt

@@ -1,6 +1,6 @@
-==========
-$dayOfYear
-==========
+========================
+$dayOfYear (aggregation)
+========================
 
 .. default-domain:: agg