Fix typo in custom instructions file name in documentation

Author: SIkebe

docs/ide/copilot-chat-context.md

@@ -48,7 +48,7 @@ The guided chat experience in Visual Studio 17.12 and later helps refine your pr
 The custom instructions feature enables you to automatically add pre-specified contextual details to your chat questions. Copilot Chat uses these instructions tailored to your specific context, such as, the way your team works, the tools you use, or the specifics of your project, when generating responses. 
 
 To configure custom instructions:
-1. [Create/add](https://docs.github.com/en/enterprise-cloud@latest/copilot/customizing-copilot/adding-custom-instructions-for-github-copilot) a custom instructions file `.github/copilot-instruction.md` in the root of your repository.
+1. [Create/add](https://docs.github.com/en/enterprise-cloud@latest/copilot/customizing-copilot/adding-custom-instructions-for-github-copilot) a custom instructions file `.github/copilot-instructions.md` in the root of your repository.
 1. Enable the feature in Visual Studio via **Tools** > **Options** > **GitHub** > **Copilot** > select **(Preview) Enable custom instructions to be loaded from .github/copilot-instructions.md files and added to requests.**.
 
 Custom instructions are not visible in the Chat view or inline chat. However, when used by Copilot, the`.github/copilot-instructions.md` file is listed in the References list of a response.