Correct "seralize" to "serialize" in comment

[Niev]

This change is 

[zetok]

Hi, commit titles need to be formatted according to commit message format, in this case it could be:

docs(dht): correct "seralize" to "serialize" in comment

[kpp]

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Reviewed 1 of 1 files at r1.
Review status: all files reviewed at latest revision, all discussions resolved, some commit checks broke.

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Comments from Reviewable

[kpp]

@Niev hello! I would like to thank you for this catch. We will fix it in #106 . Sorry for the delay. Is there any fixes you want to share? I will merge them as fast as possible.