Add autoformat parameter in cspell

@Girish-jerk, thanks for working to improve Drupal

The word 'autoformat' is already in a dictionary used by Drupal. It if wasn't there would be errors reported for the word. You can check this by using the following command which will list which the dictionaries that have the word, if any do. yarn cspell trace autoformat. The results of that show it is in the 'softwareTerms' dictionary. And then, a search .cspell.json shows that that dictionary is being used by core.