Tweak some LCD comments

Marlin/src/lcd/ultralcd_common_HD44780.h

 ////////////////////////////////////
 // Create LCD class instance and chipset-specific information
 #if ENABLED(LCD_I2C_TYPE_PCF8575)
-  // note: these are register mapped pins on the PCF8575 controller not Arduino pins
+  // NOTE: These are register-mapped pins on the PCF8575 controller, not Arduino pins.
   #define LCD_I2C_PIN_BL  3
   #define LCD_I2C_PIN_EN  2
   #define LCD_I2C_PIN_RW  1
   #define LCD_CLASS LiquidCrystal_I2C
 
 #elif ENABLED(LCD_I2C_TYPE_MCP23017)
-  //for the LED indicators (which maybe mapped to different things in lcd_implementation_update_indicators())
+  // For the LED indicators (which may be mapped to different events in lcd_implementation_update_indicators())
   #define LED_A 0x04 //100
   #define LED_B 0x02 //010
   #define LED_C 0x01 //001