Improve Serverless section in a minor way (#6081)

I just added a paragraph and some links to the serverless section.

packages/next/README.md

@@ -1593,23 +1593,26 @@ Note: we recommend putting `.next`, or your [custom dist folder](https://github.
 <details>
   <summary><b>Examples</b></summary>
   <ul>
-    <li><a href="https://github.com/zeit/now-examples/tree/master/nextjs">Now.sh</a></li>
+    <li><a href="https://github.com/zeit/now-examples/tree/master/nextjs">now.sh</a></li>
+    <li><a href="https://github.com/TejasQ/anna-artemov.now.sh">anna-artemov.now.sh</a></li>
     <li>We encourage contributing more examples to this section</li>
   </ul>
 </details>
 
-Serverless deployment dramatically improves reliability and scalability by splitting your application into many entrypoints. In case of Next.js an entrypoint is a page in the `pages` directory.
+Serverless deployment dramatically improves reliability and scalability by splitting your application into smaller parts (also called [**lambdas**](https://zeit.co/docs/v2/deployments/concepts/lambdas/)). In the case of Next.js, each page in the `pages` directory becomes a serverless lambda.
 
-To enable building serverless functions you have to enable the `serverless` build `target` in `next.config.js`:
+There are [a number of benefits](https://zeit.co/blog/serverless-express-js-lambdas-with-now-2#benefits-of-serverless-express) to serverless. The referenced link talks about some of them in the context of Express, but the principles apply universally: serverless allows for distributed points of failure, infinite scalability, and is incredibly affordable with a "pay for what you use" model.
+
+To enable **serverless mode** in Next.js, add the `serverless` build `target` in `next.config.js`:
 
 ```js
 // next.config.js
 module.exports = {
-  target: 'serverless'
-}
+  target: "serverless",
+};
 ```
 
-The serverless target will output a single file per page, this file is completely standalone and doesn't require any dependencies to run:
+The `serverless` target will output a single lambda per page. This file is completely standalone and doesn't require any dependencies to run:
 
 - `pages/index.js` => `.next/serverless/pages/index.js`
 - `pages/about.js` => `.next/serverless/pages/about.js`
@@ -1622,27 +1625,29 @@ export function render(req: http.IncomingMessage, res: http.ServerResponse) => v
 
 - [http.IncomingMessage](https://nodejs.org/api/http.html#http_class_http_incomingmessage)
 - [http.ServerResponse](https://nodejs.org/api/http.html#http_class_http_serverresponse)
-- `void` refers to the function not having a return value. Calling the function will finish the request.
+- `void` refers to the function not having a return value and is equivalent to JavaScript's `undefined`. Calling the function will finish the request.
 
-Next.js provides low-level APIs for Serverless as hosting platforms have different function signatures. In general you will want to wrap the output of a Next.js Serverless build with a compatability layer.
+#### One Level Lower
+
+Next.js provides low-level APIs for serverless deployments as hosting platforms have different function signatures. In general you will want to wrap the output of a Next.js serverless build with a compatability layer.
 
 For example if the platform supports the Node.js [`http.Server`](https://nodejs.org/api/http.html#http_class_http_server) class:
 
 ```js
-const http = require('http')
-const page = require('./.next/serverless/about.js')
-const server = new http.Server((req, res) => page.render(req, res))
-server.listen(3000, () => console.log('Listening on http://localhost:3000'))
+const http = require("http");
+const page = require("./.next/serverless/about.js");
+const server = new http.Server((req, res) => page.render(req, res));
+server.listen(3000, () => console.log("Listening on http://localhost:3000"));
 ```
 
 For specific platform examples see [the examples section above](#serverless-deployment).
 
-To summarize:
+#### Summary
 
-- Low-level API for implementing Serverless deployment
-- Every page in the `pages` directory becomes a serverless function
-- Creates the smallest possible Serverless function (50Kb base zip size)
-- Optimized for fast cold start of the function
+- Low-level API for implementing serverless deployment
+- Every page in the `pages` directory becomes a serverless function (lambda)
+- Creates the smallest possible serverless function (50Kb base zip size)
+- Optimized for fast [cold start](https://zeit.co/blog/serverless-ssr#cold-start) of the function
 - The serverless function has 0 dependencies (they are included in the function bundle)
 - Uses the [http.IncomingMessage](https://nodejs.org/api/http.html#http_class_http_incomingmessage) and [http.ServerResponse](https://nodejs.org/api/http.html#http_class_http_serverresponse) from Node.js
 - opt-in using `target: 'serverless'` in `next.config.js`