yes your page is going to stay the same but wut he posted was the second half of your DOCTYPE tag. and that is some code that tells the browser how to render your page... Since the internet is technically still in its "infancy" compared to other sources of media, the standards that have been made so far have not been taken into effect correctly by all the browsers, eg. Internet Explorer.
your entire top portion of the page should actually encorporate both the DOCTYPE and the meta content tag.
Code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head><title>Your Title</title>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
I believe would be the right code you are looking for.... however you should take a look at that full tutorial that blm gave you
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