Fix small typo in rp2040_adc.c

arch/arm/src/rp2040/rp2040_adc.c

@@ -40,7 +40,7 @@
  *
  *    -------------
  *
- *    This lower-half supports multiple drivers (/dev/adc0, /dav/dca1, etc.)
+ *    This lower-half supports multiple drivers (/dev/adc0, /dev/adc1, etc.)
  *    that each may read data from any of the ADC ports.  The driver reads
  *    whichever ADC ports are needed by ANY of ther drivers in strict
  *    round-robin fashion, passing the converted values to the drivers that
@@ -649,4 +649,4 @@ int rp2040_adc_setup(const char *path,
 }
 
 #endif /* if CONFIG_ADC */
-#endif /* if CONFIG_RP2040_ADC */
+#endif /* if CONFIG_RP2040_ADC */