Improve CScriptNum() comment
Improve CScriptNum() comment

Edited-by: Pieter Wuille <c1fe694431f9243042d0eb4561d822ec1200493d@gmail.com>
(cherry picked from commit 6004e77b926b5588e4b8eebdff843fe6652e5885)

reddcoin-project/reddcoin,reddcoin-project/reddcoin,reddcoin-project/reddcoin,reddcoin-project/reddcoin,reddcoin-project/reddcoin,reddcoin-project/reddcoin