Remove ref to watchers (#5108)

`watchers` is not required, was in an earlier version

source/_components/folder_watcher.markdown

@@ -20,8 +20,7 @@ To configure the `folder_watcher` component add to you `configuration.yaml` file
 ```yaml
 {% raw %}
 folder_watcher:
-  watchers:
-    - folder: /config
+  - folder: /config
 {% endraw %}
 ```
 
@@ -44,11 +43,10 @@ Pattern matching using [fnmatch](https://docs.python.org/3.6/library/fnmatch.htm
 ```yaml
 {% raw %}
 folder_watcher:
-  watchers:
-    - folder: /config
-      patterns:
-        - '*.yaml'
-        - '*.txt'
+  - folder: /config
+    patterns:
+      - '*.yaml'
+      - '*.txt'
 {% raw %}
 ```