Add RequestModifier to the migration guide (#4778)

Author: dsilhavy

pages/developers/migration-guides/4-to-5.md

@@ -5,6 +5,15 @@ parent: Migration Guides
 grand_parent: Developers
 ---
 
+<details open markdown="block">
+  <summary>
+    Table of contents
+  </summary>
+  {: .text-delta }
+1. TOC
+{:toc}
+</details>
+
 # Migration guide - 4.x to 5.0
 
 dash.js version 5.0 introduces changes to the build files, settings and the APIs. This guide will help you migrate your
@@ -44,7 +53,8 @@ The following entry points are defined in the `package.json`:
 
 More information about installation and building can be found [here](../../quickstart/installation.html).
 
-Multiple examples how to use dash.js in your Typescript or Webpack based JavaScript project can be found in `samples/modules`.
+Multiple examples how to use dash.js in your Typescript or Webpack based JavaScript project can be found in
+`samples/modules`.
 
 ### Settings
 
@@ -72,8 +82,8 @@ new [settings structure](https://github.com/Dash-Industry-Forum/dash.js/blob/dev
 The setting `stableBufferTime` has been renamed to `bufferTimeDefault` to align with the terminology used for setting
 the buffer target for the top quality and long form content:
 
-| v4                 | v5                  | Description                                                                          |
-|:-------------------|:--------------------|:-------------------------------------------------------------------------------------|
+| v4                 | v5                  | Description                                                                       |
+|:-------------------|:--------------------|:----------------------------------------------------------------------------------|
 | `stableBufferTime` | `bufferTimeDefault` | See [Buffer Management](../../usage/buffer-management.html) for more information. |
 
 #### changeType()
@@ -149,6 +159,12 @@ The method `getAdaptationForType()` has been renamed, use `getMainAdaptationForT
 |:-------------------------|:-----------------------------|:---------------------------------------------------------------------------------|
 | `getAdaptationForType()` | `getMainAdaptationForType()` | Returns the AdaptationSet for a given mediaType and a given `streamInfo` object. |
 
+#### RequestModifier
+
+The `RequestModifier` class has been removed. Instead, dash.js provides the opportunity to define network interceptors
+now. Network inceptors allow you to modify the outgoing network requests or the incoming network response data. For detailed
+information about network interceptors refer to the [Network Interceptor](../../usage/network-interceptor.html) section.
+
 ## Recommended changes
 
 This section lists the recommended changes that you should consider when migrating from dash.js version 4.x to 5.0.