Put false in backticks in the doc for better distinction

Co-authored-by: Shahed Nasser <[email protected]>

www/apps/book/app/learn/advanced-development/api-routes/protected-routes/page.mdx

@@ -71,7 +71,7 @@ The `authenticate` middleware function accepts three parameters:
 2. An array of types of authentication methods allowed. Both `user` and `customer` scopes support `session` and `bearer`. The `admin` scope also supports the `api-key` authentication method.
 3. An optional object of configurations accepting the following properties:
     - `allowUnauthenticated`: (default: `false`) A boolean indicating whether authentication is required. For example, you may have an API route where you want to access the logged-in customer if available, but guest customers can still access it too.
-    - `allowUnregistered` (default: false): A boolean indicating if unregistered users should be allowed access. This is useful when you want to allow users who aren’t registered to access certain routes.
+    - `allowUnregistered` (default: `false`): A boolean indicating if unregistered users should be allowed access. This is useful when you want to allow users who aren’t registered to access certain routes.
 
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