create: show audit command on the next line

This makes it easy to copy/paste the command, which needs to be
run anyway.

Library/Homebrew/dev-cmd/create.rb

@@ -224,7 +224,10 @@ module Homebrew
         end
         PyPI.update_python_resources! formula, ignore_non_pypi_packages: true if args.python?
 
-        puts "Please run `HOMEBREW_NO_INSTALL_FROM_API=1 brew audit --new #{fc.name}` before submitting, thanks."
+        puts <<~EOS
+          Please run the following command before submitting, thanks.
+            HOMEBREW_NO_INSTALL_FROM_API=1 brew audit --new #{fc.name}
+        EOS
         path
       end