You need to be precise about which document is which. You should have first received a thing called a citation or complaint or "ticket". That is what you are charged with. It will usually have a photograph of you making the right turn. If you got a second letter from the court simply confirming the arraignment date, then that is a "courtesy notice". It is not the citation. The documents they handed you on the way out of court are called "court orders". You need to be clear about which is which.
To win your case, you will need two documents: a citation that says you violated 21463(a); and a court order that says you were convicted of violating 21453(a). If you have both of those, you will win, if you don't have both of them you will lose. I can't make it any simpler for you than that.
It doesn't matter what it says on a courtesy notice from the court - that document has absolutely no legal standing whatsoever and the appeals court won't even see it.
The court has no jurisdiction to correct a faulty ticket, even if it is obviously faulty, and even if it is obvious what the officer should have written. If the police had wanted to make the correction, they would have had to have served the corrected ticket on you, so it's a good guess that it wasn't them. The fact that they wanted to amend it at the trial also suggests that the police did not believe they had already corrected it. Perhaps an eager court clerk did it. They did you an unintentional favor, it means you will get off.
The appeal court will not re-examine the findings of fact made by the trial judge. So the position of the light and trees etc is of no help to you. You will be completely wasting your time even bringing that up.
If you aren't completely sure about your documents, you can go to the court and ask to see your file, which they are obliged to show you. You can have copies made of anything in there. You may have to insist. You could also get a copy of the audio recording of your arraignment to hear what charge was read out in court.
Good luck!