Add a note for CryptoStream
Add a note for CryptoStream

So in the future, people won't make the same mistake as me.

Change-Id: I6d27260cf3c8580a8899398323dc6575a3ca9e5b
Signed-off-by: Zhaoding <785b71a09258292570a945d3d2cbd47f95dea2e9@mozy.com>
Reviewed-on: https://gerrit.dechocorp.com/85200
Reviewed-by: Jenkins <49695b0f9c673fd73dab0ff3f84b5ced9302cc6a@mozy.com>
Reviewed-by: Andrew Skowronski <96924f7a4dbe24093bb2da18f50a76703cb4a362@mozy.com>

mozy/mordor,mozy/mordor,mozy/mordor