Add missing newlines to the --download help message
Add missing newlines to the --download help message

Scons' env.subst() method strips trailing newlines if it performs
variable expansion, so we need to add newlines back.

Review URL: http://codereview.chromium.org/1513045

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@2132 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client