fix: Adjust error message on emscripten/ninja failure

src/Uno.Wasm.Bootstrap/ShellTask.cs

@@ -879,7 +879,7 @@ private void RunPackager()
 
 				if (ninjaResult.exitCode != 0)
 				{
-					throw new Exception("Failed to generate AOT layout (More details are available in diagnostics mode or using the MSBuild /bl switch)");
+					throw new Exception("Failed to run emscripten. More details are available in diagnostics logging mode or using the MSBuild /bl switch, see https://aka.platform.uno/msbuild-troubleshoot.");
 				}
 
 				CleanupLinkerRemovedFiles(workAotPath);