Corrected links to point to renamed README file in awesome-copilot repository (#41073)

Co-authored-by: Sharra-writes <sharra-writes@github.com>

Author: jonasbn

data/reusables/copilot/custom-instructions-further-reading.md

@@ -2,4 +2,4 @@
 
 * [AUTOTITLE](/copilot/concepts/response-customization) - Overview of response customization in GitHub Copilot
 * [AUTOTITLE](/copilot/how-tos/configure-custom-instructions) - How to configure custom instructions
-* [Awesome GitHub Copilot Customizations](https://github.com/github/awesome-copilot/blob/main/README.instructions.md) - Repository of community-contributed custom instructions and other customizations for specific languages and scenarios
+* [Awesome GitHub Copilot Customizations](https://github.com/github/awesome-copilot/blob/main/README.md) - Repository of community-contributed custom instructions and other customizations for specific languages and scenarios