Rename author 'R. Seroa da Motta' to 'Ronaldo Seroa da Motta'

The author has a single recorded participation in AR3 WGIII Ch7;
he is listed as 'Ronaldo Seroa da Motta' in chapter credits and
'R. Seroa da Motta' in appendix A.

The name 'Ronaldo Seroa da Motta' appears in AR5.