[InternalADC] Fixed spelling mistakes

.vscode/settings.json

@@ -320,6 +320,7 @@
                 "upcounter",
                 "USART",
                 "vbat",
+                "VBATE",
                 "velnord",
                 "vout",
                 "vsense",

src/shared/drivers/adc/InternalADC.cpp

@@ -227,7 +227,7 @@ inline void InternalADC::setChannelSampleTime(Channel channel,
 
 float InternalADC::readChannel(Channel channel)
 {
-    // Slect channel
+    // Select channel
     adc->SQR3 = channel;
 
     // Start conversion

src/shared/drivers/adc/InternalADC.h

@@ -38,7 +38,7 @@ namespace Boardcore
  * The driver uses basic ADC features, that is the single conversion mode.
  * A previous version of the driver featured injected and regular channels with
  * also DMA. Since ADC conversion time is very low, the driver has been
- * simplified to provide better usability and simplier implementation.
+ * simplified to provide better usability and simpler implementation.
  *
  * @warning This driver has been tested on f205, f407, f429, f767 and f769
  */