Typo `purge_comemnts` in class-akamai-admin.php#L203

[jgraup]

There appears to be a typo in the follow file:

https://github.com/akamai/wp-akamai/blob/master/admin/class-akamai-admin.php#L203

'purge_comemnts'   => 1,

Should probably be

'purge_comments'   => 1,