Update rss_feed_template.markdown (home-assistant#4113)

Valiceemo · frenck · commit e0c7e20b6b6e · 2017-12-01T18:26:52.000+01:00
add missing 'a' character in line 20
diff --git a/source/_components/rss_feed_template.markdown b/source/_components/rss_feed_template.markdown
@@ -17,7 +17,7 @@ The `rss_feed_template` component can export any information from Home Assistant
 For example, on Android, the app "Simple RSS Widget" can be used to display temperatures on the home screen.
 
 ```yaml
-# Example configuration.yml entry
+# Example configuration.yaml entry
 rss_feed_template:
   # Accessible on <home assistant url>/api/rss_template/garden
   # Example: https://localhost:8123/api/rss_template/garden
