docs: fix a typo (#12012)

Fix a typo

<!--

Thank you for the PR! Please go through the checklist below and make
sure you've completed all the steps.

Please review the
[CONTRIBUTING.md](https://github.com/payloadcms/payload/blob/main/CONTRIBUTING.md)
document in this repository if you haven't already.

The following items will ensure that your PR is handled as smoothly as
possible:

- PR Title must follow conventional commits format. For example, `feat:
my new feature`, `fix(plugin-seo): my fix`.
- Minimal description explained as if explained to someone not
immediately familiar with the code.
- Provide before/after screenshots or code diffs if applicable.
- Link any related issues/discussions from GitHub or Discord.
- Add review comments if necessary to explain to the reviewer the logic
behind a change

### What?

### Why?

### How?

Fixes #

-->

docs/authentication/overview.mdx

@@ -11,7 +11,7 @@ keywords: authentication, config, configuration, overview, documentation, Conten
   title="Simplified Authentication for Headless CMS: Unlocking Reusability in One Line"
 />
 
-Authentication is a critical part of any application. Payload provides a secure, portable way to manage user accounts out of the box. Payload Authentication is designed to be used in both the [Admin Panel](../admin/overview), all well as your own external applications, completely eliminating the need for paid, third-party platforms and services.
+Authentication is a critical part of any application. Payload provides a secure, portable way to manage user accounts out of the box. Payload Authentication is designed to be used in both the [Admin Panel](../admin/overview), as well as your own external applications, completely eliminating the need for paid, third-party platforms and services.
 
 Here are some common use cases of Authentication in your own applications: