Fix typos in documentation (#1440)

* Update api-playground/overview.mdx

* Update customize/themes.mdx

---------

Co-authored-by: mintlify[bot] <109931778+mintlify[bot]@users.noreply.github.com>

Author: mintlify[bot]

api-playground/overview.mdx

@@ -49,7 +49,7 @@ We recommend generating your API playground from an OpenAPI specification. See [
 
     To generate pages for only specific endpoints, list the endpoints in the `pages` property of the navigation element.
 
-    This example generates pages for only the `GET /users` and `POST /users` endpoints. To genereate other endpoint pages, add additional endpoints to the `pages` array.
+    This example generates pages for only the `GET /users` and `POST /users` endpoints. To generate other endpoint pages, add additional endpoints to the `pages` array.
 
     ```json
     "navigation": {

customize/themes.mdx

@@ -33,7 +33,7 @@ export const ThemeCard = ({ title, value, description, href }) => {
 <div className="pt-10 pb-24 px-4 px-4 max-w-3xl mx-auto prose prose-gray">
   <label className="eyebrow h-5 text-primary dark:text-primary-light text-sm font-semibold">Core Concepts</label>
   <h1 className="mt-1 mb-2 text-2xl sm:text-3xl text-gray-900 tracking-tight dark:text-gray-200 font-semibold">Themes</h1>
-  <label className="text-lg prose prose-gray dark:prose-invert">Custom the appearance of your documentation<br /><br />Configure [theme](settings#param-theme) in docs.json using one of the following themes.</label>
+  <label className="text-lg prose prose-gray dark:prose-invert">Customize the appearance of your documentation<br /><br />Configure [theme](settings#param-theme) in docs.json using one of the following themes.</label>
 
 <br />