Update README.md

- Fix typo.

Author: josesimoes

README.md

@@ -162,7 +162,7 @@ This example uses the binary format file that you can find when you are building
 nanoff --target ESP32_PSRAM_REV0 --update --serialport COM31 --deploy --image "c:\eps32-backups\my_awesome_app.bin" --address 0x1B000
 ```
 
-## STMP32 usage examples
+## STM32 usage examples
 
 ### Update the firmware of a specific STM32 target