comments: document trap methodology; rename parameters to packalign

"alignment byte count" was confusing since it could mean either the input value that should be used as the modulus base for the desired byte offset, or the number of bytes actually needed to attain modulus zero under that base. in "packalign" itself, this wasn't too confusing, but the hex transform's trap of packalign needs to work with both values alongside each other, so the name needed to be clearer. it is renamed to "alignment byte width".

of course, Evocation doesn't have parameter names as-such, this is just a comment thing

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