[Fix] Build documentation fix.

Signed-off-by: Paul Amonson <paulamonson@gmail.com>

build.gradle

@@ -92,6 +92,7 @@ Build: <i>${rootProject.version}</i></h1>
     <li>Tests: <a href="test/factory/index.html">factory</a></li>
     <li>Tests: <a href="test/logger/index.html">logger</a></li>
     <li>Tests: <a href="test/prop_store/index.html">prop_store</a></li>
+    <li>Tests: <a href="test/shutdown_hook/index.html">shutdown_hook</a></li>
     <li>Tests: <a href="test/task_manager/index.html">task_manager</a></li>
     <li>Tests: <a href="test/xdg/index.html">xdg</a></li>
 </ul>
@@ -101,6 +102,7 @@ Build: <i>${rootProject.version}</i></h1>
     <li>Coverage: <a href="jacoco/logger/index.html">logger</a></li>
     <li>Coverage: <a href="jacoco/factory/index.html">factory</a></li>
     <li>Coverage: <a href="jacoco/prop_store/index.html">prop_store</a></li>
+    <li>Coverage: <a href="jacoco/shutdown_hook/index.html">shutdown_hook</a></li>
     <li>Coverage: <a href="jacoco/task_manager/index.html">task_manager</a></li>
     <li>Coverage: <a href="jacoco/xdg/index.html">xdg</a></li>
 </ul>
@@ -110,6 +112,7 @@ Build: <i>${rootProject.version}</i></h1>
     <li>Analysis: <a href="pmd/logger.html">logger</a></li>
     <li>Analysis: <a href="pmd/factory.html">factory</a></li>
     <li>Analysis: <a href="pmd/prop_store.html">prop_store</a></li>
+    <li>Analysis: <a href="pmd/shutdown_hook.html">shutdown_hook</a></li>
     <li>Analysis: <a href="pmd/task_manager.html">task_manager</a></li>
     <li>Analysis: <a href="pmd/xdg.html">xdg</a></li>
 </ul>