docs: explain difference between how to override Nextjs... constructs…

… and lower level constructs

README.md

@@ -149,6 +149,9 @@ A: The `cdk-nextjs` package offers deep customization through _prop-based_ overr
 Q: How can I use a custom domain with `cdk-nextjs`?
 A: See [low-cost example](./examples/low-cost/app.ts).
 
+Q: What is difference between `NextjsGlobalFunctionsProps.overrides.nextjsDistribution` and `NextjsGlobalFunctionsProps.overrides.nextjsGlobalFunctions.nextjsDistributionProps`
+A: `NextjsGlobalFunctionsProps.overrides.nextjsDistribution` allows you to customize any construct's props _within_ `NextjsDistribution` and is likely what you want whereas `NextjsGlobalFunctionsProps.overrides.nextjsGlobalFunctions.nextjsDistributionProps` allows you to customize the props passed into the construct: `NextjsDistribution`. This principle also applies to other similarly named overrides.
+
 ## Acknowledgements
 
 This construct was built on the shoulders of giants. Thank you to the contributors of [cdk-nextjs-standalone](https://github.com/jetbridge/cdk-nextjs) and [open-next](https://github.com/sst/open-next).