[UPDATE] Add comments for session snapshot. 

git-svn-id: svn://svn.tuxfamily.org/svnroot/notepadplus/repository/trunk@1234 f5eea248-9336-0410-98b8-ebc06183d4e3
[RELEASE] Notepad++ 6.6.2 Release.
[BUG_FIXED] Fix session snapshot enabled issue even "remember current session" option is disabled.

git-svn-id: svn://svn.tuxfamily.org/svnroot/notepadplus/repository/trunk@1235 f5eea248-9336-0410-98b8-ebc06183d4e3