fix: NUCLEO_F446ZE boards.txt heading

Author: cjmayo

boards.txt

@@ -120,7 +120,7 @@ Nucleo_144.menu.pnum.NUCLEO_F439ZI.build.peripheral_pins=-DCUSTOM_PERIPHERAL_PIN
 Nucleo_144.menu.pnum.NUCLEO_F439ZI.openocd.target=stm32f4x
 Nucleo_144.menu.pnum.NUCLEO_F439ZI.debug.svd_file={runtime.tools.STM32_SVD.path}/svd/STM32F4xx/STM32F439.svd
 
-# NUCLEO_F446RE board
+# NUCLEO_F446ZE board
 Nucleo_144.menu.pnum.NUCLEO_F446ZE=Nucleo F446ZE
 Nucleo_144.menu.pnum.NUCLEO_F446ZE.node=NODE_F446ZE
 Nucleo_144.menu.pnum.NUCLEO_F446ZE.upload.maximum_size=524288