8343480: Remove unnecessary @SuppressWarnings annotations (javadoc)

Reviewed-by: hannesw

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

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2024, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -367,7 +367,6 @@ public class TagletWriter {
         return createAnchorAndSearchIndex(element, tagText, Text.of(tagText), desc, tree);
     }
 
-    @SuppressWarnings("preview")
     Content createAnchorAndSearchIndex(Element element, String tagText, Content tagContent, String desc, DocTree tree) {
         Content result;
         if (context.isFirstSentence && context.inSummary || context.inTags.contains(DocTree.Kind.INDEX)

src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclint/Checker.java

@@ -678,7 +678,7 @@ public class Checker extends DocTreePathScanner<Void, Void> {
 
     // <editor-fold defaultstate="collapsed" desc="HTML attributes">
 
-    @Override @DefinedBy(Api.COMPILER_TREE) @SuppressWarnings("fallthrough")
+    @Override @DefinedBy(Api.COMPILER_TREE)
     public Void visitAttribute(AttributeTree tree, Void ignore) {
         // for now, ensure we're in an HTML StartElementTree;
         // in time, we might check uses of attributes in other tree nodes

src/jdk.javadoc/share/classes/jdk/javadoc/internal/tool/Start.java

@@ -336,7 +336,6 @@ public class Start {
     /**
      * Main program - external wrapper.
      */
-    @SuppressWarnings("deprecation")
     Result begin(String... argv) {
         // Preprocess @file arguments
         List<String> allArgs;