Update sen5x.rst

The default value for the NOx index offset was changed to 1 in esphome/esphome@7131592

Furthermore I think, that only the VOC algorithm uses the saved baseline value. At least I can only find the I2C command for setting the VOC baseline and none for setting a NOx baseline in https://sensirion.com/media/documents/6791EFA0/62A1F68F/Sensirion_Datasheet_Environmental_Node_SEN5x.pdf

components/sensor/sen5x.rst

@@ -107,7 +107,7 @@ Configuration variables:
 
   - **algorithm_tuning** (*Optional*): The NOx algorithm can be customized by tuning 5 different parameters.For more details see `Engineering Guidelines for SEN5x <https://sensirion.com/media/documents/25AB572C/62B463AA/Sensirion_Engineering_Guidelines_SEN5x.pdf>`__
 
-    - **index_offset** (*Optional*): NOx index representing typical (average) conditions. Allowed values are in range 1..250. The default value is 100.
+    - **index_offset** (*Optional*): NOx index representing typical (average) conditions. Allowed values are in range 1..250. The default value is 1.
     - **learning_time_offset_hours** (*Optional*): Time constant to estimate the NOx algorithm offset from the history in hours. Past events will be forgotten after about twice the  learning time. Allowed values are in range 1..1000. The default value is 12 hour
     - **learning_time_gain_hours** (*Optional*): Time constant to estimate the NOx algorithm gain from the history in hours. Past events will be forgotten after about twice the learning time. Allowed values are in range 1..1000. The default value is 12 hours.
     - **gating_max_duration_minutes** (*Optional*): Maximum duration of gating in minutes (freeze of estimator during high NOx index signal). Zero disables the gating. Allowed values are in range 0..3000. The default value is 180 minutes
@@ -116,7 +116,7 @@ Configuration variables:
 
   - All other options from :ref:`Sensor <config-sensor>`.
 
-- **store_baseline** (*Optional*, boolean): Stores and retrieves the baseline VOC and NOx information for quicker startups. Defaults to ``true``
+- **store_baseline** (*Optional*, boolean): Stores and retrieves the baseline VOC information for quicker startups. Defaults to ``true``
 - **temperature_compensation** (*Optional*): These parameters allow to compensate temperature effects of the design-in at customer side by applying a custom temperature offset to the ambient temperature.
 
   The compensated ambient temperature is calculated as follows: