Fix heading

Author: ntrogh

release-notes/v1_98.md

@@ -229,7 +229,7 @@ You can enable this new Status Bar entry by configuring the new `setting(chat.ex
 
 We are experimenting with enhanced context for inline completions and `/fix` commands for TypeScript files. The experiment is currently scoped to Insider releases and can be enabled with the `setting(chat.languageContext.typescript.enabled)` setting.
 
-### Custom instructions for Pull Request title and description
+### Custom instructions for pull request title and description
 
 You can provide custom instructions for generating pull request title and description with the setting `setting(github.copilot.chat.pullRequestDescriptionGeneration.instructions)`.  You can point the setting to a file in your workspace, or you can provide instructions inline in your settings: