Update change log and spec for wrt-plugins-tizen_0.2.85

Update change log and spec for wrt-plugins-tizen_0.2.85

Changed Modules : Messaging, MediaContent

[Version] 0.2.85
[Project] GT-I8800,Public
[Title] SEL Verification
[Team] WebAPI
[BinType] PDA
[Customer] Open

[MediaContent] Fixed MediaContent SE UnitTC Error.

[Title] Fixed setArtist, setGenres bug & Video's setGeolocation function was implemented.
[Problem] Was not able to handle the error in a setArtist & setGenres function.
          And video's setGeolocation function was missing.
[Solution] fixed bug & implemented function.
[SCMRequest] N/A

[Messaging] SE_UNIT TC bug fix

[Issue] findMessage and findConversation bug fix
[Problem] exception on limit param with true
[Cause] exception on limit param with true
[Solution] change true to 1 on limit and offset
[SCMRequest] N/A

Change-Id: Ic7877922f7753b421a4af3f773069ff72a5303b1