This has nearly no information at all, the only thing is probably the cheat sheet.

First it's a wall of text with minimal formatting which is kind of annoying to read (though I've seen worse... much worse). You need much more formatting, and don't use oversized icons...
Second your spells chapter is exactly the same as the runes. However they are a good choice you have some false statements and not really putting any alternatives.

Your masteries don't go with the champion at all. Butcher is totally wasted since you last hit as solo top, Destruction is again for auto attackers, and since Riven is not one of those it's another waste, Brute Force ... seriously 3 AD, you think it will change the flow of the game? Also the 2% attack speed from Fury is useless, Sunder has no value without other flat ArP stuff, just one Black Cleaver won't do to much with that. Noting how much you wasted into offense should make it clear that to reach Executioner is a waste, defense tree has just much more relevant stuff for Riven.

On the items, they are basically good, but Ninja Tabi is a very situational item, and you stated Riven needs CDR so why not Ionian Boots of Lucidity? Also there are more effective items for Riven these are just not bad but not so good either.

Skilling order, well in my opinion, Broken Wings scales wores than the other 2 skills, I don't see a reason to level it first. Both Valor and Ki Burst has a bit better scaling, and their CD reduces as you level them unlike Broken Wings.

I checked your other guides and they all seem rushed, they lack information, alternative choices and reasoning. You should go for quality over quantity