D7184 made it unnecessary to start the description of a help message
with a \n, and fixed most messages accordingly. But it missed a few, and
few more were recently backported without removing the extra newline.
Before:
$ src/bitcoin-cli help importmulti importmulti "requests" ( "options" ) Import addresses/scripts (with private or public keys,...
After:
$ src/bitcoin-cli help importmulti importmulti "requests" ( "options" ) Import addresses/scripts (with private or public keys,...