Clarify percentage_command_topic and percentage_state_topic for MQTT fan (home-assistant#157460)

Co-authored-by: Jan Bouwhuis <[email protected]>

Author: dwmw2

homeassistant/components/mqtt/strings.json

@@ -729,8 +729,8 @@
               "data_description": {
                 "payload_reset_percentage": "A special payload that resets the fan speed percentage state attribute to unknown when received at the percentage state topic.",
                 "percentage_command_template": "A [template]({command_templating_url}) to compose the payload to be published at the percentage command topic.",
-                "percentage_command_topic": "The MQTT topic to publish commands to change the fan speed state based on a percentage. [Learn more.]({url}#percentage_command_topic)",
-                "percentage_state_topic": "The MQTT topic subscribed to receive fan speed based on percentage. [Learn more.]({url}#percentage_state_topic)",
+                "percentage_command_topic": "The MQTT topic to publish commands to change the fan speed state based on a percentage setting. The value shall be in the range from \"speed range min\" to \"speed range max\". [Learn more.]({url}#percentage_command_topic)",
+                "percentage_state_topic": "The MQTT topic subscribed to receive fan speed state. This is a value in the range from \"speed range min\" to \"speed range max\". [Learn more.]({url}#percentage_state_topic)",
                 "percentage_value_template": "Defines a [template]({value_templating_url}) to extract the speed percentage value.",
                 "speed_range_max": "The maximum of numeric output range (representing 100 %). The percentage step is 100 / number of speeds within the \"speed range\".",
                 "speed_range_min": "The minimum of numeric output range (off not included, so speed_range_min - 1 represents 0 %). The percentage step is 100 / the number of speeds within the \"speed range\"."