Output javadoc for enumerated values; suppress empty javadoc.

pkg/analysis_server/tool/spec/codegen_java_types.dart

Index: pkg/analysis_server/tool/spec/codegen_java_types.dart
diff --git a/pkg/analysis_server/tool/spec/codegen_java_types.dart b/pkg/analysis_server/tool/spec/codegen_java_types.dart
index 39e78c46df79f6dcd294fa8a68d98b108e9fd61d..f358f9003e7e7ce30e114de78d97fd0f55951bdc 100644
--- a/pkg/analysis_server/tool/spec/codegen_java_types.dart
+++ b/pkg/analysis_server/tool/spec/codegen_java_types.dart
@@ -183,6 +183,9 @@ class CodegenJavaType extends CodegenJavaVisitor {
       //
       for (TypeEnumValue value in values) {
         privateField(javaName(value.value), () {
+          javadocComment(toHtmlVisitor.collectHtml(() {
+            toHtmlVisitor.translateHtml(value.html);
+          }));
           writeln(
               'public static final String ${value.value} = \"${value.value}\";');
         });