update en/application-dev/connectivity/ipc-rpc-development-guideline.md.

Signed-off-by: Nking_he <6384784@qq.com>

en/application-dev/connectivity/ipc-rpc-development-guideline.md

@@ -46,7 +46,7 @@ IPC/RPC enables a proxy and a stub that run on different processes to communicat
 
 1.  Define the IPC interface **ITestAbility**.
 
-   **ITestAbility** inherits the IPC base class **IRemoteBroker** and defines descriptors, functions, and message code. The functions need to be implemented on both the proxy and stub.
+    **ITestAbility** inherits the IPC base class **IRemoteBroker** and defines descriptors, functions, and message code. The functions need to be implemented on both the proxy and stub.
 
     ```
     class ITestAbility : public IRemoteBroker {