Update filectime.xml

[KenChenRyan]

Info on what to do with the return variable. Inspired by the page for the filemtime function.

[kamil-tekiela]

I'm against this. I see no reason to point anyone to date() here.

[cmb69]

@kamil-tekiela, I generally agree, but consistency also makes sense. As is, date() is referred to by filemtime() and getlastmod(), but not by fileatime() and filectime().

[kamil-tekiela]

@kamil-tekiela, I generally agree, but consistency also makes sense. As is, date() is referred to by filemtime() and getlastmod(), but not by fileatime() and filectime().

Ok, I didn't know that. In that case, my opinion is that it would be better to do the opposite and remove date() from the other pages.