bindings: sensor: si7006: fix title

Added the Si7020 support to the bindings title as stated in the
description

Signed-off-by: Yishai Jaffe <[email protected]>

Author: yishai1999

dts/bindings/sensor/silabs,si7006.yaml

@@ -2,7 +2,7 @@
 # Copyright (c) 2023, Trent Piepho <[email protected]>
 # SPDX-License-Identifier: Apache-2.0
 
-title: Silicon Labs Si7006/13/21 RHT (Relative Humidity and Temperature) Sensor
+title: Silicon Labs Si7006/13/20/21 RHT (Relative Humidity and Temperature) Sensor
 
 description: |
   Silicon Labs Si7006 Humidity and Temperature Sensor