[XBJAPI-55] Fixed the send serial data tests (wrong comments and variables in some methods).
[XBJAPI-55] Fixed the send serial data tests (wrong comments and variables in some methods).

https://jira.digi.com/browse/XBJAPI-55

Signed-off-by: Diego Escalona <2cc07d4527ddb8161307b5e41bc6a82cc360f0ff@digi.com>

brucetsao/XBeeJavaLibrary,digidotcom/XBeeJavaLibrary,GUBotDev/XBeeJavaLibrary