mention devkit component in local server path

Author: dibarbet

CONTRIBUTING.md

@@ -120,6 +120,9 @@ In your workspace `settings.json` file, add the following lines:
 ```json
 "dotnet.server.waitForDebugger": true,
 "dotnet.server.path": "<roslynRepoRoot>/artifacts/bin/Microsoft.CodeAnalysis.LanguageServer/Debug/net9.0/Microsoft.CodeAnalysis.LanguageServer.dll"
+"dotnet.server.componentPaths": {
+    "roslynDevKit": "<roslynRepoRoot>/artifacts/bin/Microsoft.VisualStudio.LanguageServices.DevKit/Debug/net9.0
+},
 ```
 
 Replace <roslynRepoRoot> with the actual path to your Roslyn repository.