doc: tweaked wording to kivy.properties.pyx __init__ explanation
doc: tweaked wording to kivy.properties.pyx __init__ explanation

jegger/kivy,bionoid/kivy,Cheaterman/kivy,KeyWeeUsr/kivy,kivy/kivy,matham/kivy,janssen/kivy,matham/kivy,matham/kivy,matham/kivy,bionoid/kivy,janssen/kivy,jegger/kivy,inclement/kivy,Cheaterman/kivy,jkankiewicz/kivy,Cheaterman/kivy,jegger/kivy,jegger/kivy,rnixx/kivy,jkankiewicz/kivy,janssen/kivy,LogicalDash/kivy,janssen/kivy,kivy/kivy,kivy/kivy,akshayaurora/kivy,akshayaurora/kivy,bionoid/kivy,LogicalDash/kivy,bionoid/kivy,manthansharma/kivy,rnixx/kivy,inclement/kivy,rnixx/kivy,KeyWeeUsr/kivy,LogicalDash/kivy,LogicalDash/kivy,jkankiewicz/kivy,inclement/kivy,manthansharma/kivy,akshayaurora/kivy,manthansharma/kivy,Cheaterman/kivy,manthansharma/kivy,KeyWeeUsr/kivy,jkankiewicz/kivy,KeyWeeUsr/kivy