fix comments in crypt lib

apps/files_encryption/lib/crypt.php

@@ -26,7 +26,7 @@
 //  - Crypt/decrypt button in the userinterface
 //  - Setting if crypto should be on by default
 //  - Add a setting "Don´t encrypt files larger than xx because of performance reasons"
-//  - Transparent decrypt/encrpt in filesystem.php. Autodetect if a file is encrypted (.encrypted extensio)
+//  - Transparent decrypt/encrypt in filesystem.php. Autodetect if a file is encrypted (.encrypted extension)
 //  - Don't use a password directly as encryption key. but a key which is stored on the server and encrypted with the user password. -> password change faster
 //  - IMPORTANT! Check if the block lenght of the encrypted data stays the same