Update retrying client documentation

Update retrying client documentation according to our new documentation policy

Closes #309

Author: iDneprov

docs/RetryingTarantoolClient.md

@@ -11,38 +11,17 @@ By default, failed requests will be repeated only for some known network problem
 Some retry policies are available in the `TarantoolRequestRetryPolicies` class, but you may use your own implementations.
 If you want to use proxy calls or retry settings only for a number of requests, you may use configureClient(client)
 in `TarantoolClientFactory` for making a new configured client instance. Note, that the new instance will share the same
-connection pool and basic client settings, and only augment the behavior of the client.
-See an example below:
-
-```java
-
-TarantoolClient<TarantoolTuple, TarantoolResult<TarantoolTuple>> setupClient() {
-    return TarantoolClientFactory.createClient()
-        .withCredentials("admin", "secret-cluster-cookie")
-        .withAddress(container.getRouterHost(), container.getRouterPort())
-        .withProxyMethodMapping()
-        .build();
-}
-
-TarantoolClient<TarantoolTuple, TarantoolResult<TarantoolTuple>> retrying(
-    TarantoolClient<TarantoolTuple, TarantoolResult<TarantoolTuple>> client, int retries, long delay) {
-        return TarantoolClientFactory.configureClient(client)
-                    .withRetryingByNumberOfAttempts(
-                    retries,
-                    // you can use default predicates from TarantoolRequestRetryPolicies for checking errors
-                    TarantoolRequestRetryPolicies.retryNetworkErrors()
-                    // also you can use your own predicates and combine them with each other or with defaults
-                        .or(e -> e.getMessage().contains("Unsuccessful attempt"))
-                        .or(TarantoolRequestRetryPolicies.retryTarantoolNoSuchProcedureErrors()),
-                    policy -> policy.withDelay(delay))
-                    .build();
-        }
-
-...
-
-    TarantoolClient<TarantoolTuple, TarantoolResult<TarantoolTuple>> client = setupClient();
-    String result = retrying(client, 4, 500).callForSingleResult("retrying_function", String.class).get();
-    assertEquals("Success", result);
-    result = retrying(client, 2, 1000).callForSingleResult("retrying_function", String.class).get();
-    assertEquals("Success", result);
-```
+connection pool and basic client settings, and only augment the behavior of the client.  
+
+In this example I use custom delete function.
+https://github.com/tarantool/cartridge-java/blob/cb018c6ded848255637f12ef33d67cec6a019be5/src/test/resources/cartridge/app/roles/api_router.lua#L165-L176
+You can set up any client. In this case I use CRUD client.
+https://github.com/tarantool/cartridge-java/blob/cb018c6ded848255637f12ef33d67cec6a019be5/src/test/java/io/tarantool/driver/integration/ReconnectIT.java#L147-L163
+And reuse it then I need retrying client.
+https://github.com/tarantool/cartridge-java/blob/cb018c6ded848255637f12ef33d67cec6a019be5/src/test/java/io/tarantool/driver/integration/ReconnectIT.java#L194-L214
+You don't have to set up basic client if you need retying client only.
+All methods of client builder with prefix `withRetrying` can be used with `createClient`.
+  
+In this code I call `delete_with_error_if_not_found` (custom delete function) before the record was inserted to the
+database. So client recalls delete and removes the record after it was inserted.
+https://github.com/tarantool/cartridge-java/blob/cb018c6ded848255637f12ef33d67cec6a019be5/src/test/java/io/tarantool/driver/integration/ReconnectIT.java#L82-L109