docs(context): add missing finish statement

docs/en/src/context.md

@@ -40,6 +40,7 @@ An instance of how it would be written inside an application:
     .data(env_struct)
     .data(s3_storage)
     .data(db_core)
+    .finish();
 ```
 
 ### Request data

docs/zh-CN/src/context.md

@@ -39,6 +39,7 @@ impl Query {
     .data(env_struct)
     .data(s3_storage)
     .data(db_core)
+    .finish();
 ```
 
 ### 请求数据