Update changelogs

Author: SerhiiCho

.github/CHANGELOG_V2.md .github/CHANGELOG_2x.md.github/CHANGELOG_V2.md renamed to .github/CHANGELOG_2x.md

@@ -1,4 +1,4 @@
-# Release Notes v2
+# Release Notes 2.x
 
 ## v2.3.1 (2022-01-27)
 - Added more information to `CONTRIBUTE.md` file

.github/CHANGELOG_V3.md .github/CHANGELOG_3x.md.github/CHANGELOG_V3.md renamed to .github/CHANGELOG_3x.md

@@ -1,4 +1,6 @@
-# Release Notes v2
+# Release Notes 3.x
+
+[Documentation for version 3.x](https://php-ago.github.io/3.x/)
 
 ## v3.2.6 (2024-11-01)
 - Moved repo to a new organization `php-ago/ago`

CHANGELOG.md

@@ -1,20 +1,20 @@
 # Release Notes
 
 ## v4.0.0 (2024-12-11)
-> 🚀 [Upgrade Guide from v3 to v4](https://php-ago.github.io/v4/upgrade)
+> 🚀 [Upgrade Guide from v3 to v4](https://php-ago.github.io/4.x/upgrade)
 - Breaking changes
     - ⚠️ Drop support for PHP `7.1`, `7.2`, `7.3`, `7.4`, `8.0`
     - ⚠️ The `Option` class is now an enum type
     - ⚠️ Remove second parameter from `Serhii\TimeAgo\Lang::set()` method, which was `$overwrites`. Now, overwrites are defined through the configuration
 - Improvements
-    - 🧑‍💻 Codebase refactoring and cleanup
+    - ♻️ Codebase refactoring and cleanup
     - 🧑‍💻 Remove `InvalidDateFormatException` exception that was thrown from `TimeAgo::trans()` in the version `3`
     - ✨ Added support for PHP 8.4
     - ✨ Added new option `Option::RESET_CONF` to reset the configuration to default values
     - 🧑‍💻 Added `configure` and `reconfigure` methods to the `TimeAgo` class, you can read about them in the [documentation](https://php-ago.github.io/v4/configurations#configuration-options)
     - 🧑‍💻 Improve time calculation including leap years
     - 🇨🇳 Add Chinese Simplified language support
 
-## [Release Notes v3](.github/CHANGELOG_V3.md)
-## [Release Notes v2](.github/CHANGELOG_V2.md)
+## [Release Notes 3.x](.github/CHANGELOG_3x.md)
+## [Release Notes 2.x](.github/CHANGELOG_2x.md)
 ## [Meaning of Emojis in Changelog](.github/EMOJIS.md)