update facility hours copy, size, and add sub message

Author: SnowboardTechie

src/site/includes/hours.liquid

@@ -8,9 +8,10 @@
 				<h3 class="vads-u-font-size--lg vads-u-margin-top--0 vads-u-line-height--1 vads-u-margin-bottom--1">
 					Hours</h3>
 			{% elsif headerType == 'clinical' %}
-				<h2 class="vads-u-margin-top--2p5 vads-u-margin-bottom--1">
-					Clinical hours
-				</h2>
+				<h3 class="vads-u-margin-top--2p5 vads-u-margin-bottom--1">
+					Facility hours
+				</h3>
+				<p>Hours may vary for different services. Select a service on this page to check the hours.</p>
 			{% elsif headerType == 'office' %}
 				<h3 class="vads-u-font-size--lg vads-u-margin-top--0 vads-u-line-height--1 vads-u-margin-bottom--1">
 					Office hours</h3>