Fix extension-editing display name and description

extensions/extension-editing/package.nls.json

 {
-	"displayName": "Package File Editing",
-	"description": "Provides IntelliSense for VS Code extension points and linting capabilities in package.json files."
+	"displayName": "Extension Authoring",
+	"description": "Provides linting capabilities for authoring extensions."
 }
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