Fix typo in doxygen comment.
Fix typo in doxygen comment.

(cherry picked from commit 3a05ba1bfcba72bb91643510d96bd2f49a8420bd)

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