docs: update folder name to follow dart plugin conventions

Author: CodingAleCR

CHANGELOG.md

@@ -10,7 +10,7 @@
 
 ## 0.4.0
 
-Check out [our 0.4.0 migration guide](./docs/migration_guide_4.md) for information on how to migrate your code.
+Check out [our 0.4.0 migration guide](./guides/migration_guide_4.md) for information on how to migrate your code.
 
 - ❗️✨  Added: String extension to allow `toUri()` usage when importing the library. Since `http` dropped support for string url usage and since Dart does not yet support function overloading, we had to implement an alternative through extensions.
 - ✨  Added: Flutter web support 🌐   (`badCertificateCallback` and `findProxy` features are not supported on Flutter Web due to browser limitations)

README.md

@@ -10,7 +10,7 @@ This is a plugin that lets you intercept the different requests and responses fr
 
 ## Quick Reference
 
-**Already using `http_interceptor`? Check out the [0.4.0 migration guide](./docs/migration_guide_4.md) for quick reference on the changes made and how to migrate your code.**
+**Already using `http_interceptor`? Check out the [0.4.0 migration guide](./guides/migration_guide_4.md) for quick reference on the changes made and how to migrate your code.**
 
 - [Installation](#installation)
 - [Usage](#usage)