docs: add missing dot (#39314)

Co-authored-by: spcma <46758907+spcma@users.noreply.github.com>



## Bug

- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have helpful link attached, see `contributing.md`

## Documentation / Examples

- [x] Make sure the linting passes by running `pnpm lint`
- [x] The examples guidelines are followed from [our contributing doc](https://github.com/vercel/next.js/blob/canary/contributing.md#adding-examples)

docs/getting-started.md

@@ -84,7 +84,7 @@ Create two directories `pages` and `public` at the root of your application:
 
 Next.js is built around the concept of [pages](/docs/basic-features/pages.md). A page is a [React Component](https://reactjs.org/docs/components-and-props.html) exported from a `.js`, `.jsx`, `.ts`, or `.tsx` file in the `pages` directory. You can even add [dynamic route](/docs/routing/dynamic-routes) parameters with the filename.
 
-Inside the `pages` directory add the `index.js` file to get started. This is the page that is rendered when the user visits the root of your application
+Inside the `pages` directory add the `index.js` file to get started. This is the page that is rendered when the user visits the root of your application.
 
 Populate `pages/index.js` with the following contents: