docs: update section numbers in README.md for clarity

Author: floydkim

README.md

@@ -177,7 +177,7 @@ Add the following line to the end of the file.
 </p>
 </details>
 
-### 2-1. Expo Setup
+### 3. Expo Setup
 For Expo projects, you can use the automated config plugin instead of manual setup.
 
 **Add plugin to your Expo configuration:**
@@ -201,7 +201,7 @@ npx expo prebuild
 **Requirements**
 Expo SDK: 50.0.0 or higher
 
-### 3. "CodePush-ify" Your App
+### 4. "CodePush-ify" Your App
 
 The root component of your app should be wrapped with a higher-order component.
 
@@ -245,7 +245,7 @@ export default CodePush({
 > The URL for fetching the release history should point to the resource location generated by the CLI tool.
 
 
-#### 3-1. Telemetry Callbacks
+#### 4-1. Telemetry Callbacks
 
 Please refer to the [CodePushOptions](https://github.com/Soomgo-Mobile/react-native-code-push/blob/f0d26f7614af41c6dd4daecd9f7146e2383b2b0d/typings/react-native-code-push.d.ts#L76-L95) type for more details.
 - **onUpdateSuccess:** Triggered when the update bundle is executed successfully.
@@ -255,7 +255,7 @@ Please refer to the [CodePushOptions](https://github.com/Soomgo-Mobile/react-nat
 - **onSyncError:** Triggered when an unknown error occurs during the update process. (`CodePush.SyncStatus.UNKNOWN_ERROR` status)
 
 
-### 4. Configure the CLI Tool
+### 5. Configure the CLI Tool
 
 > [!TIP]
 > For a more detailed and practical example, refer to the `CodePushDemoApp` in `example` directory. ([link](https://github.com/Soomgo-Mobile/react-native-code-push/tree/master/Examples/CodePushDemoApp))