[docs] Fixed bad path to 'Contributing' md (which was moved).
[docs] Fixed bad path to 'Contributing' md (which was moved).

Haivision/srt,Cinegy/srt,Haivision/srt,Haivision/srt,Cinegy/srt,ethouris/srt,Cinegy/srt,Haivision/srt,ethouris/srt,ethouris/srt,Cinegy/srt,ethouris/srt