PR review: Fix punctuation in custom instructions configuration steps

Fix duplicate ending punctuation.

Author: AnnaMHuff

docs/ide/copilot-chat-context.md

@@ -49,7 +49,7 @@ The custom instructions feature enables you to automatically add pre-specified c
 
 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. 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.**.
+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.