stm32f0: miniblink: update comments to match code

Brought the comments up to date wrt. the actual code (inconsistency removed).

examples/stm32/f0/stm32f0-discovery/miniblink/miniblink.c

@@ -27,14 +27,14 @@
 
 static void gpio_setup(void)
 {
-	/* Enable GPIOB clock. */
+	/* Enable GPIOC clock. */
 	/* Manually: */
 	//RCC_AHBENR |= RCC_AHBENR_GPIOCEN;
 	/* Using API functions: */
 	rcc_periph_clock_enable(RCC_GPIOC);
 
 
-	/* Set GPIO6 (in GPIO port B) to 'output push-pull'. */
+	/* Set GPIO8 (in GPIO port C) to 'output push-pull'. */
 	/* Using API functions: */
 	gpio_mode_setup(PORT_LED, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, PIN_LED);
 }