chore(javadoc): remove <h3> tag

Author: bevzzz

src/main/java/io/weaviate/client6/v1/api/collections/batch/BatchContext.java

@@ -864,7 +864,7 @@ private void reconnectNow() {
     /**
      * Schedule a task to {@link #reconnect} after a delay.
      *
-     * <h3>API Note</h3>
+     * <p>
      * The task is scheduled on {@link #scheduledExec} even if
      * {@code delaySeconds == 0} to avoid blocking gRPC worker
      * thread,

src/main/java/io/weaviate/client6/v1/internal/grpc/GrpcTransport.java

@@ -16,7 +16,7 @@ <RequestT, RequestM, ReplyM, ResponseT> CompletableFuture<ResponseT> performRequ
   /**
    * Create stream for batch insertion.
    *
-   * <h3>API Note</h3>
+   * <p>
    * Batch insertion is presently the only operation performed over a
    * StreamStream connection, which is why we do not parametrize this
    * method.