Fixed a typo.

cheat/cheatsheets/convert

@@ -15,5 +15,5 @@ convert original-image.jpg -resize 100x converted-image.png
 for file in `ls original/image/path/`;
     do new_path=${file%.*};
     new_file=`basename $new_path`;
-    convert $file -resize 150 conerted/image/path/$new_file.png;
+    convert $file -resize 150 converted/image/path/$new_file.png;
 done