[update] Whats new and migration

Author: serhiipylypchuk1991

docs/guides/configuration.md

@@ -138,22 +138,24 @@ You can also specify custom controls as objects in the [`toolbar`](api/config/to
 
 You can specify custom buttons within a [toolbar](api/config/toolbar.md) as follows:
 
-~~~jsx {6-14}
+~~~jsx {6-16}
 new richtext.Richtext("#root", {
     toolbar: [
         "bold",
         "italic",
         "separator",
         {
             type: "button",
-            id: "btn1",
-            icon: "wxo-help",
-            css: "rounded",
-            label: "Custom button", 
-            tooltip: "Some tooltip", 
-            handler: () => { /* some action here */ }
+            id: "custom",
+            css: "wx-primary",
+            label: "Count characters",
+            handler: () => {
+                const text = widget.getValue(richtext.text.toText);
+                const charCount = text.replace(/\s/g, "").length;
+                document.getElementById("count").innerText = charCount;
+            }
         },
-        // other custom buttons
+        // other custom controles
     ],
     // other configuration properties
 });

docs/news/whats_new.md

@@ -100,28 +100,28 @@ A full list of new events is available [here](/category/richtext-events/)
 ## Deprecated API
 
 :::warning
-Do not use the deprecated API in your projects!
+Do not use the deprecated API in your projects! <br/> Refer to the [Migration](news/migration.md) topic for more information.
 :::
 
-### ❌ Deprecated properties
+### [Deprecated properties](news/migration.md#properties-migration)
 
-- `customStats`  
-- `mode`  
-- `toolbarBlocks`
+- [`customStats`](news/migration.md#--customstats)  
+- [`mode`](news/migration.md#--mode--layoutmode)  
+- [`toolbarBlocks`](news/migration.md#--toolbarblocks--toolbar)
 
-### ❌ Deprecated methods
+### [Deprecated methods](news/migration.md#methods-migration)
 
 - `exitFullScreen()`  
 - `fullScreen()`  
 - `getEditorAPI()`  
 - `getStats()`  
 - `paint()`
 
-### ❌ Deprecated internal methods
+### Deprecated internal methods
 
-- `events.fire()`
+- [`events.fire()`](news/migration.md#--fire--use-exec-and-intercept)
 
-### ❌ Deprecated events
+### Deprecated events
 
 - `Action`  
 - `Change`