Added documentation on lifecycle of CipherSource-supplied Cipher instance.

Author: erickok

lib/src/main/java/nl/nl2312/okio/cipher/CipherSource.kt

@@ -5,11 +5,13 @@ import okio.ForwardingSource
 import okio.Source
 import javax.crypto.Cipher
 
+
 /**
  * Accepts an encrypted [Source] and deciphers it on the fly.
  *
  * <p>Chunked and partial reading is supported. However, the deciphered output text is not complete until the [Source]
- * is drained. Do not attempt to (re-)use the supplied [cipher] until the full source stream is completed.
+ * is drained. It is an error to attempt to (re-)use the supplied [cipher] during or after the streaming, without
+ * explicitly calling its [Cipher.init] again.
  */
 class CipherSource(
         source: Source,