[examples/ls] Improve comments.

examples/ls.lua

@@ -11,6 +11,12 @@
 -- lua ls.lua -a -h src
 -- lua ls.lua -a -t a.dir b.dir c.dir
 --
+-- Supported options:
+-- -a list hidden files
+-- -t sort by time, most recent first
+-- -S sort by size, largest first
+-- -h print size next to each file in kilobytes (1024)
+--
 -- Author: Lorenzo Cogotti, The DoubleFourteen Code Forge
 
 local osx = require 'osx'
@@ -87,7 +93,7 @@ local function listfilenames(filenames, bufs, total)
         if hflag then
             write(ksize(buf.size or 0), " ")
         end
-        write(filename, '\n')
+        write(filename, "\n")
     end
 end