Add info re LSP YAML server to Basic config section

Author: lenkis

doc/code_snippets/snippets/config/instances.enabled/instance_scope/config.yaml

@@ -1,4 +1,3 @@
-# yaml-language-server: $schema=https://download.tarantool.org/tarantool/schema/config.schema.json
 groups:
   group001:
     replicasets:

doc/code_snippets/snippets/config/instances.enabled/instance_scope/config_annotated.yaml

@@ -0,0 +1,11 @@
+# yaml-language-server: $schema=https://download.tarantool.org/tarantool/schema/config.schema.json
+
+groups:
+  group001:
+    replicasets:
+      replicaset001:
+        instances:
+          instance001:
+            iproto:
+              listen:
+              - uri: '127.0.0.1:3301'

doc/platform/configuration.rst

@@ -77,7 +77,7 @@ Basic instance configuration
 
 The example below shows a sample configuration of a single Tarantool instance:
 
-..  literalinclude:: /code_snippets/snippets/config/instances.enabled/instance_scope/config.yaml
+..  literalinclude:: /code_snippets/snippets/config/instances.enabled/instance_scope/config_annotated.yaml
     :language: yaml
     :dedent:
 
@@ -86,6 +86,15 @@ The example below shows a sample configuration of a single Tarantool instance:
 -   The ``replicasets`` section contains one replica set named *replicaset001*.
 -   The ``groups`` section contains one group named *group001*.
 
+.. note:
+
+   The initial line in this sample contains a link to an annotated Tarantool configuration
+   schema for a YAML language server (e.g. for `LSP-Yaml`).
+   With this link you can set up your code editor (VScode, Neovim, Sublime, etc.) to get
+   full-text annotations and completion prompts when you work with Tarantool configuration.
+
+..  image:: images/yaml-annotated.png
+    :align: center
 
 .. _configuration_scopes: