Reword newline docs

Fixes #737

docs/docs.html

@@ -318,7 +318,7 @@ <h5>Unparse Config Options</h5>
 									<code>newline</code>
 								</td>
 								<td>
-									The newline sequence. Must be one of <code>"\r"</code>, <code>"\n"</code>, or <code>"\r\n"</code>.
+									The character used to determine newline sequence. It defaults to <code>"\r\n"</code>.
 								</td>
 							</tr>
 							<tr>