make comments match the code in secure channel implementation #1198
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Reviewing the secure channel I noticed some places where the comments said something different to what the code did. I have fixed the comments to match the code.
The first thing was in the cipher selection step, the comments said
cmp(hash(lr || rpub), hash(rr || lpub))
but the code joined those the other way around. Also there was a spot later on where an earlier comment had been copypasted from before, and didn't make sense anymore.
I also noticed a few small improvements that could be made to the cipher selection process, but will post another issue.