Docs: s/GTK/GTK+/
Docs: s/GTK/GTK+/

marclaporte/WeasyPrint,Kozea/WeasyPrint,andrewleech/WeasyPrint,marclaporte/WeasyPrint,jasco/WeasyPrint,prepare/TestWeasyPrint,Kozea/WeasyPrint,prepare/TestWeasyPrint,andrewleech/WeasyPrint,jasco/WeasyPrint