Added new config entries for lat/long for sensor.geo_rss_events (#6703)

* Added new config entries for lat/long for sensor.geo_rss_events

* Added futher up in text that lat/long can be set

* Minor changes

source/_components/sensor.geo_rss_events.markdown

@@ -21,7 +21,7 @@ This sensor is particularly useful if events occur unexpectedly in the vicinity
   <img src='{{site_root}}/images/screenshots/geo-rss-incidents-group-screenshot.png' />
 </p>
 
-The reference point for comparing the distance is defined by `latitude` and `longitude` in the basic configuration.
+The reference point for comparing the distance is by default defined by `latitude` and `longitude` in the basic configuration.
 
 Only entries of the feed are considered that define a location as `point` or `polygon` in *georss.org* format or as *WGS84 latitude/longitude*.
 
@@ -54,6 +54,16 @@ name:
   required: false
   type: string
   default: Event Service
+latitude:
+  description: Latitude of the coordinates around which events are considered.
+  required: false
+  type: string
+  default: Latitude defined in your `configuration.yaml`
+longitude:
+  description: Longitude of the coordinates around which events are considered.
+  required: false
+  type: string
+  default: Longitude defined in your `configuration.yaml`
 radius:
   description: The distance in kilometers around the Home Assistant's coordinates in which events are considered.
   required: false