sizes and typo corrected

`-size +20000k` actually matches files bigger than 20,000*1,024=20,480,000 Bytes, not 20,000,000 Bytes as in “2 Megabytes”.

cheat/cheatsheets/find

@@ -19,11 +19,11 @@ find ./path/ -name '*.txt' -exec rm '{}' \;
 # To find files with extension '.txt' and look for a string into them:
 find ./path/ -name '*.txt' | xargs grep 'string'
 
-# To find files with size bigger than 5 Mb and sort them by size:
+# To find files with size bigger than 5 Mebibyte and sort them by size:
 find . -size +5M -type f -print0 | xargs -0 ls -Ssh | sort -z
 
-# To find files bigger thank 2 MB and list them:
-find . -type f -size +20000k -exec ls -lh {} \; | awk '{ print $9 ": " $5 }'
+# To find files bigger than 2 Megabyte and list them:
+find . -type f -size +200000000c -exec ls -lh {} \; | awk '{ print $9 ": " $5 }'
 
 # To find files modified more than 7 days ago and list file information
 find . -type f -mtime +7d -ls