Make clear the search is using google

So people don't get surprised when they are suddenly on a different webpage when searching for something.

Author: WebFreak001

dlang.org.ddoc

@@ -414,7 +414,7 @@ SEARCH_BOX=
         <form method="get" action="https://google.com/search">
             <input type="hidden" id="domains" name="domains" value="dlang.org">
             <input type="hidden" id="sourceid" name="sourceid" value="google-search">
-            $(SPANID search-query, <input id="q" name="q" placeholder="Search">)$(SPANID search-dropdown, $(SPANC helper,
+            $(SPANID search-query, <input id="q" name="q" placeholder="Google Search">)$(SPANID search-dropdown, $(SPANC helper,
                 <select id="sitesearch" name="sitesearch" size="1">
                     <option value="dlang.org">Entire Site</option>
                     <option $(SEARCHDEFAULT_SPEC) value="dlang.org/spec">Language</option>