Specify gzip required in tootctl emoji help (#11000)

lib/mastodon/emoji_cli.rb

@@ -15,9 +15,9 @@ module Mastodon
     option :suffix
     option :overwrite, type: :boolean
     option :unlisted, type: :boolean
-    desc 'import PATH', 'Import emoji from a TAR archive at PATH'
+    desc 'import PATH', 'Import emoji from a TAR GZIP archive at PATH'
     long_desc <<-LONG_DESC
-      Imports custom emoji from a TAR archive specified by PATH.
+      Imports custom emoji from a TAR GZIP archive specified by PATH.
 
       Existing emoji will be skipped unless the --overwrite option
       is provided, in which case they will be overwritten.