+1,000 to all the above. Pretend it never happened, and so will the spoke.
I strongly doubt you nicked it enough to matter, but even if you did, it'll be thousands of miles before it's an issue. If/when it does break, a single broken spoke on a 36h wheel is a non issue. Spokes break all the time, but nobody's is getting hurt in the process.
If it really bothers you the best remedy is to see a hypnotist and block it out of your mind.
__________________
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