Docs: improve readability in WebSocket middleware documentation

tests/test_ws_router.py

@@ -235,7 +235,7 @@ def test_depend_validation():
 
 def test_depend_err_middleware():
     """
-    Verify that it is possible to write custom WebSocket middleware to catch errors
+    Verify that custom WebSocket middleware can catch errors
     """
 
     @websocket_middleware
@@ -244,7 +244,7 @@ def test_depend_err_middleware():
             return await call_next()
         except Exception as e:
             await websocket.close(code=status.WS_1006_ABNORMAL_CLOSURE, reason=repr(e))
-
+            
     myapp = make_app(middleware=[Middleware(errorhandler)])
     client = TestClient(myapp)
     with pytest.raises(WebSocketDisconnect) as e: