update step name

Author: zhongkechen

README.md

@@ -18,15 +18,11 @@ Build resilient, long-running AWS Lambda functions that automatically checkpoint
 Your durable function extends `DurableHandler<I, O>` and implements `handleRequest(I input, DurableContext ctx)`. The `DurableContext` is your interface to durable operations:
 
 - `ctx.step()` – Execute code and checkpoint the result
-- `ctx.stepAsync()` – Start a concurrent step  
 - `ctx.wait()` – Suspend execution without compute charges
 - `ctx.createCallback()` – Wait for external events (approvals, webhooks)
-- `ctx.waitForCallback()` – Run an isolated child context with its own checkpoint log
-- `ctx.waitForCallbackAsync()` – Start a concurrent child context
+- `ctx.waitForCallback()` – Simplify callback handling by combining callback creation and submission in one operation
 - `ctx.invoke()` – Invoke another Lambda function and wait for the result
-- `ctx.invokeAsync()` – Start a concurrent Lambda function invocation
 - `ctx.runInChildContext()` – Run an isolated child context with its own checkpoint log
-- `ctx.runInChildContextAsync()` – Start a concurrent child context
 
 ## Quick Start
 

sdk/src/main/java/software/amazon/lambda/durable/DurableContext.java

@@ -384,7 +384,7 @@ public <T> DurableFuture<T> waitForCallbackAsync(
                     var callback = childCtx.createCallback(
                             name + "-callback", typeToken, finalWaitForCallbackConfig.callbackConfig());
                     childCtx.step(
-                            name + "-step",
+                            name + "-submitter",
                             Void.class,
                             stepCtx -> {
                                 func.accept(callback.callbackId(), stepCtx);