Turn on Word Wrap in your text editor and a single-line comment is as good as a multi-line comment. Like so:
{#Integer ege't urna. Praesent rhoncus, lorem nec facilisis ultrices, magna leo pellentesque neque, eu aliquam diam tellus aliquam pede. Vivamus gravida, risus in pellentesque ultricies, urna odio condimentum sem, ege't tempus augue felis non erat. Nam quis lorem semper pede accumsan vestibulum. Vivamus condimentum.}
If you really need a multi-line comment, you simply build your own out of multiple single-line comments, just like you would in an Apache configuration file:
{#Integer e