rflink deprecation and other doc fixes (#11452)

* Remove docs for old misspelled configs

They've been deprecated already since July 2017,
https://github.com/home-assistant/home-assistant/pull/8348

* Remove incorrect deprecation markers on switch aliases

Was apparently inadvertently added in 4d739b04c67bd43ac0f68e938290208b0d2f2bc1,
https://github.com/home-assistant/home-assistant.io/pull/7098

* Talk about switch instead of light in switch group doc

* Grammar fix

source/_integrations/light.rflink.markdown

@@ -99,18 +99,6 @@ devices:
           required: false
           default: true
           type: boolean
-        aliasses:
-          description: (**deprecated**) Alternative RFLink ID's this device is known by.
-          required: false
-          type: [list, string]
-        group_aliasses:
-          description: "(**deprecated**) `aliases` which only respond to group commands."
-          required: false
-          type: [list, string]
-        no_group_aliasses:
-          description: "(**deprecated**) `aliases` which do not respond to group commands."
-          required: false
-          type: [list, string]
 {% endconfiguration %}
 
 ### Light state

source/_integrations/sensor.rflink.markdown

@@ -63,13 +63,9 @@ devices:
           description: "Alternative RFLink ID's this device is known by."
           required: false
           type: [list, string]
-        aliasses:
-          description: "(**deprecated**) Alternative RFLink ID's this device is known by."
-          required: false
-          type: [list, string]
 {% endconfiguration %}
 
-## Sensors types
+## Sensor types
 
 Sensor type values:
 

source/_integrations/switch.rflink.markdown

@@ -82,20 +82,20 @@ devices:
           default: 1
           type: integer
         group:
-          description: Allow light to respond to group commands (ALLON/ALLOFF).
+          description: Allow switch to respond to group commands (ALLON/ALLOFF).
           required: false
           default: true
           type: boolean
         aliases:
-          description: "(**deprecated**) Alternative RFLink ID's this device is known by."
+          description: Alternative RFLink ID's this device is known by.
           required: false
           type: [list, string]
         group_aliases:
-          description: "(**deprecated**) `aliases` which only respond to group commands."
+          description: "`aliases` which only respond to group commands."
           required: false
           type: [list, string]
         no_group_aliases:
-          description: "(**deprecated**) `aliases` which do not respond to group commands."
+          description: "`aliases` which do not respond to group commands."
           required: false
           type: [list, string]
 {% endconfiguration %}