Update READMEs

Author: andreyaksenov

doc/code_snippets/snippets/sharding/instances.enabled/sharded_cluster/README.md

@@ -1,16 +1,70 @@
 # Sharded cluster
 
-A sample application created in the [Creating a sharded cluster](https://www.tarantool.io/en/doc/latest/how-to/vshard_quick/) tutorial.
+A sample application demonstrating how to configure a [sharded](https://www.tarantool.io/en/doc/latest/concepts/sharding/) cluster.
 
 ## Running
 
-To learn how to run the cluster, see the [Working with the cluster](https://www.tarantool.io/en/doc/latest/how-to/vshard_quick/#working-with-the-cluster) section.
+To run the cluster, go to the `sharding` directory in the terminal and perform the following steps:
 
+1. Install dependencies defined in the `*.rockspec` file:
 
-## Packaging
+   ```console
+   $ tt build sharded_cluster
+   ```
+   
+2. Run the cluster:
 
-To package an application into a `.tgz` archive, use the `tt pack` command:
+   ```console
+   $ tt start sharded_cluster
+   ```
 
-```console
-$ tt pack tgz --app-list sharded_cluster
-```
+3. Connect to the router:
+
+   ```console
+   $ tt connect sharded_cluster:router-a-001
+   ```
+   
+4. Call `vshard.router.bootstrap()` to perform the initial cluster bootstrap:
+
+   ```console
+   sharded_cluster:router-a-001> vshard.router.bootstrap()
+   ---
+   - true
+   ...
+   ```
+
+5. Insert test data:
+
+   ```console
+   sharded_cluster:router-a-001> insert_data()
+   ---
+   ...
+   ```
+   
+6. Connect to storages in different replica sets to see how data is distributed across nodes:
+
+   a. `storage-a-001`:
+
+      ```console
+      sharded_cluster:storage-a-001> box.space.bands:select()
+      ---
+      - - [1, 614, 'Roxette', 1986]
+        - [2, 986, 'Scorpions', 1965]
+        - [5, 755, 'Pink Floyd', 1965]
+        - [7, 998, 'The Doors', 1965]
+        - [8, 762, 'Nirvana', 1987]
+      ...
+      ```
+   
+   b. `storage-b-001`:
+
+      ```console
+      sharded_cluster:storage-b-001> box.space.bands:select()
+      ---
+      - - [3, 11, 'Ace of Base', 1987]
+        - [4, 42, 'The Beatles', 1960]
+        - [6, 55, 'The Rolling Stones', 1962]
+        - [9, 299, 'Led Zeppelin', 1968]
+        - [10, 167, 'Queen', 1970]
+      ...
+      ```

doc/code_snippets/snippets/sharding/instances.enabled/sharded_cluster_crud/README.md

@@ -1,57 +1,7 @@
 # Sharded cluster with CRUD
 
-A sample application demonstrating how to set up a sharded cluster with the [crud](https://github.com/tarantool/crud) module.
+A sample application created in the [Creating a sharded cluster](https://www.tarantool.io/en/doc/latest/how-to/vshard_quick/) tutorial.
 
 ## Running
 
-Before running the cluster, execute the `tt build` command in the [sharding](../../../sharding) directory:
-
-```shell
-$ tt build sharded_cluster_crud
-```
-
-Then, start all instances in the cluster using `tt start`:
-
-```shell
-$ tt start sharded_cluster_crud
-```
-
-## Bootstrapping a cluster
-
-After starting instances, you need to bootstrap the cluster.
-Connect to the router instance using `tt connect`:
-
-```shell
-$ tt connect sharded_cluster_crud:router-a-001
-   • Connecting to the instance...
-   • Connected to sharded_cluster_crud:router-a-001
-```
-
-Call `vshard.router.bootstrap()` to perform the initial cluster bootstrap:
-
-```shell
-sharded_cluster_crud:router-a-001> vshard.router.bootstrap()
----
-- true
-...
-```
-
-
-## Inserting data
-
-To insert sample data, call `crud.insert_many()` on the router:
-
-```lua
-crud.insert_many('bands', {
-    { 1, box.NULL, 'Roxette', 1986 },
-    { 2, box.NULL, 'Scorpions', 1965 },
-    { 3, box.NULL, 'Ace of Base', 1987 },
-    { 4, box.NULL, 'The Beatles', 1960 },
-    { 5, box.NULL, 'Pink Floyd', 1965 },
-    { 6, box.NULL, 'The Rolling Stones', 1962 },
-    { 7, box.NULL, 'The Doors', 1965 },
-    { 8, box.NULL, 'Nirvana', 1987 },
-    { 9, box.NULL, 'Led Zeppelin', 1968 },
-    { 10, box.NULL, 'Queen', 1970 }
-})
-```
+To learn how to run the cluster, see the [Working with the cluster](https://www.tarantool.io/en/doc/latest/how-to/vshard_quick/#working-with-the-cluster) section.