Update internal methods

Author: serhiipylypchuk1991

docs/api/internal/detach.md

@@ -1,5 +1,5 @@
 ---
-sidebar_label: api.detach() ?
+sidebar_label: api.detach()
 title: on Method
 description: You can learn about the on method in the documentation of the DHTMLX JavaScript RichText library. Browse developer guides and API reference, try out code examples and live demos, and download a free 30-day evaluation version of DHTMLX RichText.
 ---
@@ -8,10 +8,42 @@ description: You can learn about the on method in the documentation of the DHTML
 
 ### Description
 
+@short: Allows removing/detaching event handlers
+
 ### Usage
 
+~~~jsx {}
+api.detach( event: string ): void;
+~~~
+
 ### Parameters
 
+- `event` - (required) an event to be detached
+
 ### Events
 
+:::info
+The full list of RichText internal events can be found [**here**](/category/richtext-events/)
+:::
+
 ### Example
+
+~~~jsx {16-17}
+// initialize RichText
+const editor = new richtext.Richtext("#root", {
+    // configuration parameters
+});
+
+// subscribe on the "set-font-size" event
+editor.api.on("set-font-size", (obj) => {
+    console.log(obj.fontSize);
+});
+
+// set the text font size
+editor.api.exec("set-font-size", {
+    fontSize: "36px"
+}); 
+
+// detach the "set-font-size" event
+editor.api.detach("set-font-size");
+~~~

docs/api/internal/exec.md

@@ -27,7 +27,7 @@ api.exec(
 ### Events
 
 :::info
-The full list of the RichText internal events can be found [**here**](/category/richtext-events/)
+The full list of RichText internal events can be found [**here**](/category/richtext-events/)
 :::
 
 ### Example

docs/api/internal/intercept.md

@@ -27,7 +27,7 @@ api.intercept(
 ### Events
 
 :::info
-The full list of the RichText internal events can be found [**here**](api/overview/main_overview.md/#richtext-events)
+The full list of RichText internal events can be found [**here**](/category/richtext-events/)
 :::
 
 ### Example

docs/api/internal/on.md

@@ -27,7 +27,7 @@ api.on(
 ### Events
 
 :::info
-The full list of the RichText internal events can be found [**here**](/category/richtext-events/)
+The full list of RichText internal events can be found [**here**](/category/richtext-events/)
 :::
 
 ### Example

sidebars.js

@@ -70,7 +70,7 @@ module.exports = {
                                 image: "/img/docusaurus.png"
                             },
                             items: [
-                                //"api/internal/detach",
+                                "api/internal/detach",
                                 "api/internal/exec",
                                 "api/internal/intercept",
                                 "api/internal/on",