[skip ci] docs(guide): improve instructions for yarn workspaces

Author: nklayman

docs/guide/guide.md

@@ -19,8 +19,9 @@ module.exports = {
     electronBuilder: {
       // List native deps here if they don't work
       externals: ['my-native-dep'],
-      // Set this to your project's node_modules folder if it is not ./node_modules (for yarn workspaces)
-      nodeModulesPath: '../../node_modules'
+      // If you are using Yarn Workspaces, you may have multiple node_modules folders
+      // List them all here so that VCP Electron Builder can find them
+      nodeModulesPath: ['../../node_modules', './node_modules]
     }
   }
 }