Add javadoc, spotlessapply

Signed-off-by: Neo <neotheprogramist@proton.me>

src/main/java/org/hyperledger/besu/ethereum/trie/verkle/node/BranchNode.java

@@ -212,6 +212,7 @@ public void markDirty() {
     dirty = true;
   }
 
+  /** Marks the node as clean, indicating that it no longer needs to be persisted. */
   @Override
   public void markClean() {
     dirty = false;

src/main/java/org/hyperledger/besu/ethereum/trie/verkle/node/LeafNode.java

@@ -142,6 +142,7 @@ public void markDirty() {
     dirty = true;
   }
 
+  /** Marks the node as clean, indicating that it no longer needs to be persisted. */
   @Override
   public void markClean() {
     dirty = false;

src/main/java/org/hyperledger/besu/ethereum/trie/verkle/node/NullLeafNode.java

@@ -114,18 +114,23 @@ public boolean isDirty() {
     return false;
   }
 
+  /**
+   * Mark the `NullNode` as dirty (not used, no operation).
+   *
+   * <p>This method intentionally does nothing.
+   */
   @Override
-  public void markClean() {
+  public void markDirty() {
     // do nothing
   }
 
   /**
-   * Mark the `NullNode` as dirty (not used, no operation).
+   * Marks the node as clean, indicating that it no longer needs to be persisted.
    *
    * <p>This method intentionally does nothing.
    */
   @Override
-  public void markDirty() {
+  public void markClean() {
     // do nothing
   }
 }

src/main/java/org/hyperledger/besu/ethereum/trie/verkle/node/NullNode.java

@@ -124,6 +124,11 @@ public void markDirty() {
     // do nothing
   }
 
+  /**
+   * Mark the `NullNode` as clean.
+   *
+   * <p>This method intentionally does nothing.
+   */
   @Override
   public void markClean() {
     // do nothing

src/main/java/org/hyperledger/besu/ethereum/trie/verkle/node/StoredNode.java

@@ -147,6 +147,7 @@ public void markDirty() {
     dirty = true;
   }
 
+  /** Marks the node as no longer needs to be persisted */
   @Override
   public void markClean() {
     dirty = false;