Remove improvements and updates.

Removed as the changelog contians the notes and the class info has the details.

Author: h2zero

docs/Improvements_and_updates.md

@@ -4,7 +4,7 @@ This guide describes the required changes to existing projects migrating from th
 
 **The changes listed here are only the required changes that must be made**, and a short overview of options for migrating existing applications.
 
-For more information on the improvements and additions please refer to the [class documentation](https://h2zero.github.io/esp-nimble-cpp/annotated.html) and [Improvements and updates](Improvements_and_updates.md)
+For more information on the improvements and additions please refer to the [class documentation](https://h2zero.github.io/esp-nimble-cpp/annotated.html)
 
 * [General Changes](#general-information)
 * [Server](#server-api)

docs/Migration_guide.md

@@ -38,9 +38,7 @@ This library is intended to be compatible with the original ESP32 BLE functions
 
 If you have not used the original Bluedroid library please refer to the [New user guide](New_user_guide.md).
 
-If you are familiar with the original library, see: [The migration guide](Migration_guide.md) for details.  
-
-Also see [Improvements and updates](Improvements_and_updates.md) for information about non-breaking changes.  
+If you are familiar with the original library, see: [The migration guide](Migration_guide.md) for details.   
 
 For more advanced usage see [Usage tips](Usage_tips.md) for more performance and optimization.  
 <br/>