wireprotopeer: clarify some variable names now that we allow snake_case
"encargsorres" is hard to parse ("encarg sorres" sounds like it might
be Spanish to me, and indeed Google Translate tells me that it's
Catalan for "order sands"). Let's clarify with some added underscores
and longer names.
Differential Revision: https://phab.mercurial-scm.org/D9973
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