8366278: Form control element <select> has no associated label

Reviewed-by: hannesw

src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/SearchWriter.java

@@ -108,6 +108,7 @@ public class SearchWriter extends HtmlDocletWriter {
 
         var select = HtmlTree.of(HtmlTag.SELECT)
                 .setId(HtmlId.of("search-modules"))
+                .put(HtmlAttr.ARIA_LABEL, resources.getText("doclet.selectModule"))
                 .add(HtmlTree.of(HtmlTag.OPTION)
                         .put(HtmlAttr.VALUE, "")
                         .add(contents.getContent("doclet.search.all_modules")));

src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/resources/standard.properties

@@ -787,3 +787,6 @@ doclet.NoFrames_specified=\
 doclet.footer_specified=\
     The -footer option is no longer supported and will be ignored.\n\
     It may be removed in a future release.
+
+doclet.selectModule=\
+    Select the module to search in.