Add hide battery low documentation (#4989)

Author: andrew-codechimp

docs/configuration.md

@@ -11,6 +11,7 @@ Global configuration settings can be changed by selecting the configuration cog
 |Battery increase threshold | The threshold where the battery_notes_battery_increased event is fired, use this event for battery replaced automations. The threshold is the difference in increase between previous and current battery level. |
 | Auto discovery | Will automatically match devices against the library and create a setup flow within the integrations page, this occurs at instegration startup and repeats every 24 hours. |
 | Enable battery replaced | New battery notes will have a battery replaced sensor and butoon. If disabled new devices added to battery notes will have the battery replaced sensor and button disabled. Any battery notes you have previously added you will have to disable/re-enable these sensors manually, which also means you can enable specific sensors of important ones you want to track. |
+| Hide battery low | Hide the battery low binary sensor when a battery percentage is available, avoiding duplication on generated dashboards. |
 | User library | If specified then a user library file will be searched prior to the main library, the user library must be in the same format as the library and placed in the same folder (config/.storage/battery_notes). Only really used for dev purposes. |
 
 # Debug Logging