change the url

android/README.md

@@ -68,7 +68,7 @@ OralTrainerSdk.init(
 
 ## Sentence Boundary API
 
-The SDK defaults to `https://video_service.d1kt.cn` and requests:
+The SDK defaults to `https://videoservice.d1kt.cn` and requests:
 
 ```text
 GET /api/v1/videos/{sha256}/sentence-boundaries
@@ -93,7 +93,7 @@ Override the service only when a staging or private deployment is required:
 OralTrainerSdk.init(
     context,
     OralTrainerSdkConfig(
-        sentenceBoundaryApiBaseUrl = "https://video_service.d1kt.cn",
+        sentenceBoundaryApiBaseUrl = "https://videoservice.d1kt.cn",
         assessmentApiKey = BuildConfig.ORAL_TRAINER_CLIENT_KEY,
     )
 )