docs: fix remaining issues following rst to myst transition

docs/howto/auth/awscognito.md

@@ -29,11 +29,11 @@ application to your `tljh` configuration.
      http(s)://<my-tljh-ip-address>
      ```
 
-   > - **Auth Domain** Create an auth domain e.g. \<my_jupyter_hub>:
-   >
-   >   ```
-   >   https://<<my_jupyter_hub>.auth.eu-west-1.amazoncognito.com
-   >   ```
+   - **Auth Domain** Create an auth domain e.g. \<my_jupyter_hub>:
+
+     ```
+     https://<<my_jupyter_hub>.auth.eu-west-1.amazoncognito.com
+     ```
 
 ## Install and configure an AWS EC2 Instance with userdata
 

docs/howto/auth/github.md

@@ -29,9 +29,9 @@ You'll need a GitHub account in order to complete these steps.
 
    - When you're done filling in the page, it should look something like this:
 
-     > ```{image} ../../images/auth/github/create_application.png
-     > :alt: Create a GitHub OAuth application
-     > ```
+     ```{image} ../../images/auth/github/create_application.png
+     :alt: Create a GitHub OAuth application
+     ```
 
 2. Click "Register application". You'll be taken to a page with the registered application details.