Update split keyboard docs (#4735)

* Remove unused I2C_MASTER_RIGHT setting

* Update documentation about split keyboard options

2 files changed, 2 insertions, 3 deletions

diff --git a/quantum/split_common/serial.c b/quantum/split_common/serial.c
index 4df8d103b..1315377a3 100644
--- a/quantum/split_common/serial.c
+++ b/quantum/split_common/serial.c
@@ -90,7 +90,7 @@
 
 #ifndef SELECT_SOFT_SERIAL_SPEED
 #define SELECT_SOFT_SERIAL_SPEED 1
-//  0: about 189kbps (Experiment only)
+//  0: about 189kbps (Experimental only)
 //  1: about 137kbps (default)
 //  2: about 75kbps
 //  3: about 39kbps
diff --git a/quantum/split_common/split_util.c b/quantum/split_common/split_util.c
index e4475c535..da04c8d3f 100644
--- a/quantum/split_common/split_util.c
+++ b/quantum/split_common/split_util.c
@@ -36,8 +36,7 @@ static void setup_handedness(void) {
     #ifdef EE_HANDS
       isLeftHand = eeprom_read_byte(EECONFIG_HANDEDNESS);
     #else
-      // I2C_MASTER_RIGHT is deprecated, use MASTER_RIGHT instead, since this works for both serial and i2c
-      #if defined(I2C_MASTER_RIGHT) || defined(MASTER_RIGHT)
+      #ifdef(MASTER_RIGHT)
         isLeftHand = !has_usb();
       #else
         isLeftHand = has_usb();