Nicely done my friend! A banana slamtastic guide to Donkey Kong, and may I add it's well organized one to. Donkey Kong is one of my mains, and one of my favorite Nintendo characters/series (though for me nothing can truly beat the EarthBound/MOTHER series of course). I can tell you that you have pretty much covered Big Donkey in and out, mentioning his pros, cons, and some solutions to his cons, with the addition of teaching me some new tricks that I am now at this very moment eager to try out for myself (Example: short hop + down special = potential easy down smash). I personally don't use down & side special that much (normally just as a joke with friends). However, I'm proud to see that you're at least suggesting some handy tricks toward those moves, and that they're available if you ever wish to use them (like I said before, down special is looking much more appealing to me now thanks to you). To add, I liked how you let people take into consideration that DK isn't the greatest character to play, and is best played when chilled out and/or defensively. All in all I would definitely recommend this guide to anyone debating on playing as Donkey Kong.
P.S Gotta say I that love the title, and I feel happy whenever I see good Donkey Kong players, it just proves that you don't need a lot of bells and whistles to win. Finally I just wanted to add that there's a combo I normally do with DK when my opponent's damage is at low % (Grab, pummel a few times, up throw, jump and up air once, land and up tilt twice, then after I just consistently continue to juggle them with aerials and tilts reading their every move.)