Make the text generated by showAnnotations more noticable in docs

Made the foreground of the "included in docs by annotation..." orange,
the same color used in the header of the docs page. This text is inserted
when the showAnnotations flag is used with doclava

Change-Id: I56e0b2060ed42cd0d077fff149d578d31c763f95

tools/droiddoc/templates-sdk/assets/css/default.css

@@ -7334,4 +7334,5 @@ a.home-new-cta-btn:hover,
 .annotation-message {
     display: block;
     font-style: italic;
-}
+    color: #F80;
+}