fix: typo in readme

Author: amit-ksh

README.md

@@ -121,7 +121,7 @@ To use an existing function locally you don't need to do anything. Just check th
 
 To create a new function, you will need to create two files:
 
-- One in `src/lambdas` where the logic will live. These are the ones that will be deployed to Netlify. These functions follow [this format](https://docs.netlify.com/functions/build-with-javascript/#synchronous-function-format).
+- One in `src/lambda` where the logic will live. These are the ones that will be deployed to Netlify. These functions follow [this format](https://docs.netlify.com/functions/build-with-javascript/#synchronous-function-format).
 - One in `src/api` that will be just a wrapper around the previous one in order to be compatible with Gatsby functions. More on the [Gatbsy docs](https://www.gatsbyjs.com/docs/reference/functions/getting-started/) for the format they follow.
 
 Typically, you will develop and test functions in the Gatsby context, by running `yarn start`.