fix to conformance section (#566)

Author: rachaelbradley

src/pages/guidelines/index.astro

@@ -176,8 +176,9 @@ import GuidelinesRespec from "@/components/respec/GuidelinesRespec.astro";
 
 				<p><b>Core Requirements</b> &mdash; Requirements that must be met in order to conform. These include requirements that ensure:</p>
 				<ul>
-					<li>contents are detectable by user agents and AT,</li>
-					<li>content is conveyed to multiple senses and can be used by multiple inputs,content does not cause immediate, physical harm,</li>
+					<li>content is detectable by user agents and AT,</li>
+					<li>content is conveyed to multiple senses and can be used by multiple inputs,</li>
+					<li>content does not cause immediate, physical harm, and</li>
 					<li>necessary support is available such as captions, text alternatives, and expanded forms of abbreviations.</li>
 				</ul>