[Docs] changes from feedback

docs/api-reference/next.config.js/runtime-configuration.md

@@ -28,7 +28,7 @@ Place any server-only runtime config under `serverRuntimeConfig`.
 
 Anything accessible to both client and server-side code should be under `publicRuntimeConfig`.
 
-> A page that relies on `publicRuntimeConfig` **must** use `getInitialProps` to opt-out of [Automatic Static Optimization](/docs/advanced-features/automatic-static-optimization.md).
+> A page that relies on `publicRuntimeConfig` **must** use `getInitialProps` to opt-out of [Automatic Static Optimization](/docs/advanced-features/automatic-static-optimization.md). Runtime configuration won't be available to any page (or component in a page) without `getInitialProps`.
 
 To get access to the runtime configs in your app use `next/config`, like so:
 

docs/api-reference/next/link.md

@@ -49,6 +49,8 @@ export default Home
 - [`replace`](#replace-the-url-instead-of-push) - Replace the current `history` state instead of adding a new url into the stack. Defaults to `false`
 - [`scroll`](#disable-scrolling-to-the-top-of-the-page) - Scroll to the top of the page after a navigation. Defaults to `true`
 
+External URLs, and any links that don't require a route navigation using `/pages`, don't need to be handled with `Link`; use the anchor tag for such cases instead.
+
 ## Dynamic routes
 
 A `Link` to a dynamic route is a combination of the `href` and `as` props. A link to the page `pages/post/[pid].js` will look like this:

docs/api-routes/introduction.md

@@ -46,6 +46,8 @@ export default (req, res) => {
 }
 ```
 
+To fetch API endpoints, take a look into any of the examples at the start of this section.
+
 > API Routes [do not specify CORS headers](https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS), meaning they are **same-origin only** by default. You can customize such behavior by wrapping the request handler with [micro-cors](/docs/api-routes/api-middlewares.md#micro-support).
 
 > API Routes do not increase your client-side bundle size. They are server-side only bundles.