SSH/Diagnosis: getSFTPLastError() -> getLastSFTPError()

Author: terrafrost

docs/diagnosis.md

@@ -60,7 +60,7 @@ Calling `isConnected()` prior to any of these methods will return `bool(false)`.
 
 `getErrors()` returns an array of all errors or messages that have been reported by the server at the SSH layer. `getLastError()` returns the most recent of these errors / messages.
 
-`getSFTPErrors()` and `getSFTPLastError()` work similarily for the SFTP layer.
+`getSFTPErrors()` and `getLastSFTPError()` work similarily for the SFTP layer.
 
 ## getServerIdentification()