Document zabbix publish_string_states config (#36734)

source/_integrations/zabbix.markdown

@@ -64,6 +64,11 @@ publish_states_host:
   description: The host that will receive the state changes from Home Assistant. It needs to be manually created in Zabbix first and have the template associated with it (see above).
   required: false
   type: string
+publish_string_states:
+  description: Also publish string states, i.e. states which cannot be cast to a numeric value.
+  required: false
+  type: boolean
+  default: false
 exclude:
   type: list
   description: Configure which integrations should be excluded from being published to Zabbix. ([Configure Filter](#configure-filter))
@@ -111,6 +116,7 @@ zabbix:
   username: USERNAME
   password: PASSWORD
   publish_states_host: homeassistant
+  publish_string_states: true
   exclude:
     domains:
       - device_tracker