docs: added medusa-react snippets in how-to guides (#3091)

* added medusa-react snippets

* added more code snippets

* added medusa-react snippets

* docs: added medusa-react snippets to storefront how-to

* docs: added medusa-react snippets in admin how-to

* docs: fixed incorrect link

docs/api/admin-spec3-base.yaml

@@ -286,11 +286,20 @@ components:
 
         In this API reference, you'll find in the cURL request samples the use of `{api_token}`. This is where you must pass the API token.
 
-        If you're alternatively following along with the JS Client request samples, you must provide the `apiKey` option when creating the Medusa client:
+        If you're following along with the JS Client request samples, you must provide the `apiKey` option when creating the Medusa client:
 
-        ```js
+        ```ts
         const medusa = new Medusa({ baseUrl: MEDUSA_BACKEND_URL, maxRetries: 3, apiKey: '{api_token}' })
         ```
+
+        If you're using Medusa React, you can pass the `apiKey` prop to `MedusaProvider`:
+        
+        ```tsx
+        <MedusaProvider
+          apiKey='api_token}'
+          //...
+        >
+        ```
       scheme: bearer
     cookie_auth:
       type: apiKey