Update sx126x.md - Minor typo (#5364)

Configuration variable (dtata) is part of the sx126x.send_packet action.

Author: PaulSchulz

content/components/sx126x.md

@@ -191,7 +191,7 @@ on_...:
       data: [0x1F, 0x3E, 0x06, 0x5F, 0x4F, 0x5F, 0xAC, 0xB1]
 ```
 
-### Configuration variables
+#### Configuration variables
 
 - **data** (**Required**, list): The packet to send, length should match the configured
   payload_length.