Add a helpful nudge to set a friendly_name (#4826)

Author: bdraco

components/esphome.rst

@@ -30,9 +30,13 @@ Configuration variables:
   characters, digits and hyphens, and can be at most 24 characters long by default, or 31
   characters long if ``name_add_mac_suffix`` is ``false``.
   See :ref:`esphome-changing_node_name`.
-- **friendly_name** (*Optional*, string): This is the name sent to the frontend. It is used
-  by Home Assistant as the integration name, device name, and is automatically prefixed to entities
-  where necessary.
+- **friendly_name** (*Optional*, string):  
+  This name is sent to the frontend and used by Home Assistant as  
+  the integration and device name. It also gets prefixed to entity  
+  names when needed. While optional, leaving it out can result in  
+  less intuitive names and a less polished experience in Home  
+  Assistant. Setting a `friendly_name` helps keep things clear,  
+  consistent, and easier to manage.
 - **area** (*Optional*, string): This is the area sent to the frontend. It is used
   by Home Assistant as the area / zone which the node belongs to.