Update runtime files

runtime/ftplugin/corn.vim

@@ -0,0 +1,18 @@
+" Vim filetype plugin
+" Language:         Corn
+" Original Author:  Jake Stanger (mail@jstanger.dev) 
+" License:          MIT
+" Last Change:      2023 May 28
+
+if exists('b:did_ftplugin')
+  finish
+endif
+let b:did_ftplugin = 1
+
+setlocal formatoptions-=t
+
+" Set comment (formatting) related options.
+setlocal commentstring=//\ %s comments=:// 
+
+" Let Vim know how to disable the plug-in.
+let b:undo_ftplugin = 'setlocal commentstring< comments< formatoptions<'