minor comment for Messaging API

Dear Eduardo ,

How about to add the full explanation of SMS/MMS abbreviation in Abstract part ?
And, how about to add the standard information about SMS/MMS in Reference Section  ?

For example:
[SMS]
  http://en.wikipedia.org/wiki/Short_Message_Service

[MMS]
  http://en.wikipedia.org/wiki/Multimedia_Messaging_Service


Best Regards,

--- Jonathan Jeon