Update adding-a-new-ssh-key-to-your-github-account.md

The updated docs that use ed25519 to generate the key are merged.  This needs to match those steps

Author: brockneedscoffee

content/github/authenticating-to-github/adding-a-new-ssh-key-to-your-github-account.md

@@ -24,7 +24,7 @@ After adding a new SSH key to your {% data variables.product.product_name %} acc
   If your SSH key file has a different name than the example code, modify the filename to match your current setup. When copying your key, don't add any newlines or whitespace.
 
   ```shell
-  $ pbcopy < ~/.ssh/id_rsa.pub
+  $ pbcopy < ~/.ssh/id_ed25519.pub
   # Copies the contents of the id_rsa.pub file to your clipboard
   ```