Fix Kconfig style

Replace help => ---help---
Remove spaces from Kconfig
Add comments

arch/xtensa/src/esp32/Kconfig

@@ -256,16 +256,17 @@ if ESP32_OPENETH
 	int "Number of Ethernet DMA Rx buffers"
 	range 1 64
 	default 4
-		help
+	---help---
 		Number of DMA receive buffers, each buffer is 1600 bytes.
 
 config ESP32_OPENETH_DMA_TX_BUFFER_NUM
 	int "Number of Ethernet DMA Tx buffers"
 	range 1 64
 	default 1
-		help
+	---help---
 		Number of DMA transmit buffers, each buffer is 1600 bytes.
-endif
+
+endif # ESP32_OPENETH
 
 config ESP32_I2C
 	bool

boards/arm/xmc4/xmc4800-relax/Kconfig

@@ -10,4 +10,5 @@ config ECAT
 	default y
 	---help---
 		Enable start up of the EtherCAT interface and configure ports.
+
 endif