fix typo (#594)

Author: jyecusch

src/pages/reference/cli/local-development.mdx

@@ -46,6 +46,6 @@ This command will generate a self-signed certificate and key for your applicatio
 nitric start --https-preview
 ```
 
-If you need use a custom certificate and key, you can place them in the `.nitric/tls` directory in your project and Nitric will use them to serve your application over HTTPS. The files must be named `cert.pem` and `key.pem` respectively.
+If you need to use a custom certificate and key, you can place them in the `.nitric/tls` directory in your project and Nitric will use them to serve your application over HTTPS. The files must be named `cert.pem` and `key.pem` respectively.
 
 <Note>This feature is experimental and may change in future releases.</Note>