Fix spelling for Airbnb (#11505)

docs/smart-sensor.rst

@@ -24,7 +24,7 @@ Smart Sensor
 .. warning::
 
   This is an **early-access** feature and might change in incompatible ways in future Airflow versions.
-  However this feature can be considered bug-free, and AirB'n'B has been using this feature in Production
+  However this feature can be considered bug-free, and Airbnb has been using this feature in Production
   since early 2020 and has significantly reduced their costs for heavy use of sensors.
 
 The smart sensor is a service (run by a builtin DAG) which greatly reduces airflow’s infrastructure