Update image source in domain.html to use consistent filename casing for hero images

Author: Yohan-Christmith

domain.html

@@ -70,13 +70,13 @@ <h1 class="domain-title">Project Domain Overview</h1>
               <div class="blob-bottom-clip" aria-hidden="true">
                 <img
                   class="hero-person hero-person-base"
-                  src="./assets/images/domainhero.png"
+                  src="./assets/images/DomainHero.png"
                   alt=""
                 />
               </div>
               <img
                 class="hero-person hero-person-pop"
-                src="./assets/images/domainhero.png"
+                src="./assets/images/DomainHero.png"
                 alt="Project team collaborating in a planning meeting"
               />
             </div>