Add documentation for Hydrawise valves (#32489)

Co-authored-by: Franck Nijhof <git@frenck.dev>

source/_integrations/hydrawise.markdown

@@ -6,6 +6,7 @@ ha_category:
   - Irrigation
   - Sensor
   - Switch
+  - Valve
 ha_config_flow: true
 ha_release: 0.71
 ha_iot_class: Cloud Polling
@@ -18,6 +19,7 @@ ha_platforms:
   - binary_sensor
   - sensor
   - switch
+  - valve
 ha_integration_type: integration
 ---
 
@@ -28,6 +30,7 @@ There is currently support for the following device types within Home Assistant:
 - [Binary sensor](#binary-sensor)
 - [Sensor](#sensor)
 - [Switch](#switch)
+- [Valve](#valve)
 
 ## Prerequisites
 
@@ -74,3 +77,9 @@ When `manual_watering` is `on` the zone will run for 15 minutes.
 {% note %}
 Due to changes in the Hydrawise API the status of the Auto Watering switches has changed. Under normal conditions the Auto Watering switches correctly reflect the Smart Watering schedule on the Hydrawise mobile or web app. However, if a rain sensor is connected to the system and it is active (rain detected), or the zone is running the Auto Watering switch will turn off. After both of those conditions are removed the switch will again show the correct Auto Watering condition.
 {% endnote %}
+
+## Valve
+
+A valve is added for each zone allowing manual control of zone watering.
+
+When a zone's valve is opened through Home Assistant, it will have an automatic shutoff time set to the zone's default watering duration configured in the Hydrawise [mobile or web app](https://www.hydrawise.com).