Yes, so... I have a couple poins to bring up:
1. You are the best Nocturne that you know? Mate, just remove that. People, like me, will get curious and look you up only to find out you are bronze. IF you are past lying to yourself, you will understand that because you are bronze, you can't be that good at this game. Now, for all I know, you may really be the best Nocturne out there, but such statements without proof make your guide lose credibility.
2. Lack of explanation of items is a big no-no. Look at all the guides here and you'll see people explaining why they choose item X and why it is good or why item Y is not viable. You only provide some items(some with which I don't agree) without explaining to the reader(a complete stranger to Nocturne) why they are that good.
3. Mercury's Treads are a strong option IMO and you didn't even consider them.
4. You may get more in-depth as to why you max E over W. Some people may consider the lower cooldown isn't worth losing that much attack speed(you didn't even talk about how W gives you attack speed in the guide, other than the "notes").
5. The final build lacks the defense to back it up. Consider that you are jumping an ADC who most likely has a support that may stop you. Even if he doesn't have a support, he may be able to put some range between you and himself and before catching up to him, he'd wreck you. At the same time, unlike other assassins, Nocturne lacks an escape mechanism so after killing the ADC, you'd have to stay ther eand fight.
6. You may try to make a new paragraph in which you take the reader through a basic Nocturne game and say what you should be doing, why you should be doing, what to do in case X happens, how to respond to Y. This paragraph would be a great choice instead of the "Tips and Tricks" section.
7. You should, at least briefly, go over why you chose those runes and masteries.
I am not downvoting, but I am expecting you to add more to your guide and remove certain things. At the same time, a big part of the mobaFIRE community doesn't give a **** about content as long as the guide isn't pretty, so you should try making it look nicer.