DOC-3179: RI tutorial restructure (part F)

Author: dwdougherty

src/ds/json/introduction.md renamed to src/ds/json/intro.md

@@ -8,8 +8,7 @@ Primary features include:
 - Documents are stored as binary data in a tree structure, allowing fast access to sub-elements.
 - Typed atomic operations for all JSON value types.
 
-### PRE-REQUISITES
-**You will need:**
+### Prerequisites
 
 [Redis Stack](https://redis.io/download) >=7.2.0-v7 \
 OR \

src/ds/prob/intro.md

@@ -30,7 +30,6 @@ The following data structures trade perfect accuracy for extreme memory efficien
 * Provide notification when an element is removed from the top k list.
 * Discards older approaches like "count-all" and "admit-all-count-some" in favor of a "count-with-exponential-decay" strategy.
 
-
 ### Prerequisites
 
 [Redis Stack Server](https://redis.io/download) >=7.2.0-v7 \

src/ds/ts/cross-key.md

@@ -1,3 +1,7 @@
-## Placeholder
+## Cross-key aggregations
 
-This is placeholder content.
+`TS.MRANGE` and `TS.REVMRANGE` can also take an optional `AGGREGATION` argument. This allows you to run queries across different keys using different filters. In the following example, the specified filter looks across time series keys that have a matching `region` label, calculates the daily average using the `AGGREGATION` clause, and groups the data by region and applying the `sum` reducer function.
+
+```
+TS.MRANGE - + WITHLABELS FILTER region=(east,west) AGGREGATION avg 86400000 GROUPBY region REDUCE sum
+```

src/ds/ts/retrieve.md

@@ -83,7 +83,7 @@ There are optional arguments for each of the `RANGE` commands:
 - `FILTER_BY_VALUE` - filter by a range of values.
 - `COUNT` - when used without `AGGREGATION`, it limits the number of reported samples. When used with `AGGREGATION` it limits the number of reported buckets.
 - `ALIGN` - is a time bucket alignment control for `AGGREGATION`. It controls the time bucket timestamps by changing the reference timestamp on which a bucket is defined. See the manual page for more information.
-- `AGGREGATION` - the same set of aggregator functions you've already seen are available for the `RANGE` commands.
+- `AGGREGATION` - the same set of aggregator functions you've already seen with `TS.CREATERULE` are available for the `RANGE` commands.
 - `BUCKETTIMESTAMP` - controls how bucket timestamps are reported. See the manual page for more information.
 - `EMPTY` - is a flag, which, when specified, reports aggregations for empty buckets. See the manual page for more information.
 
@@ -104,10 +104,6 @@ TS.RANGE bike_sales_3_per_day - + FILTER_BY_VALUE 3000 5000
 TS.RANGE bike_sales_3 - + COUNT 10
 ```
 
-```redis AGGREGATION in action
-TS.RANGE bike_sales_1 - + AGGREGATION avg 86400000
-```
-
 ### `TS.MRANGE` and `TS.MREVRANGE`
 
 `TS.MRANGE` and `TS.MREVRANGE` are nearly identical to their `RANGE` counterparts, except: (1) they require a label-based `FILTER` argument and (2) they may optionally take a `GROUPBY/REDUCE` argument.

src/ds/ts/single-key.md

@@ -1,3 +1,7 @@
-## Placeholder
+## Single-key aggregations
 
-This is placeholder content.
+The previous tutorial showed that the `TS.RANGE` and `TS.REVRANGE` commands can take an optional `AGGREGATION` argument. Aggregations using the `RANGE` commands allow you to make ad hoc queries using, perhaps, a different aggregator than what you've used in your aggregation rules. In the following example, data are aggregated the `avg` function, calculating and reporting average daily sales for a bike shop.
+
+```redis AGGREGATION in action
+TS.RANGE bike_sales_1 - + AGGREGATION avg 86400000
+```

src/sq/introduction.md renamed to src/sq/intro.md

@@ -14,8 +14,7 @@ The search and query features of Redis Stack allow you to use Redis as a:
 - Secondary index
 - Search engine
 
-### PRE-REQUISITES
-**You will need:**
+### Prerequisites
 
 [Redis Stack](https://redis.io/download) >=7.2.0-v7 \
 OR \

src/sq/learn-more.md

@@ -1,6 +1,6 @@
 ### Documentation
 
-* [Search and Query home](https://redis.io/docs/interact/search-and-query/?utm_source=redisinsight&utm_medium=main&utm_campaign=tutorials)
+* [Search and query home](https://redis.io/docs/interact/search-and-query/?utm_source=redisinsight&utm_medium=main&utm_campaign=tutorials)
 
 ### Social