Tweak some pin errors

Marlin/src/pins/esp32/pins_E4D.h

 #elif EXTRUDERS > 1 || E_STEPPERS > 1
   #error "E4d@box only supports one E Stepper. Comment out this line to continue."
 #elif HOTENDS > 1
-  #error "E4d@box currently supports only one hotend. Comment out this line to continue."
+  #error "E4d@box only supports one hotend / E-stepper. Comment out this line to continue."
 #endif
 
 #define BOARD_INFO_NAME       "E4D@BOX"

Marlin/src/pins/esp32/pins_FYSETC_E4.h

 #elif EXTRUDERS > 1 || E_STEPPERS > 1
   #error "FYSETC E4 only supports one E Stepper. Comment out this line to continue."
 #elif HOTENDS > 1
-  #error "FYSETC E4 currently supports only one hotend. Comment out this line to continue."
+  #error "FYSETC E4 only supports one hotend / E-stepper. Comment out this line to continue."
 #endif
 
 #define BOARD_INFO_NAME       "FYSETC_E4"

Marlin/src/pins/esp32/pins_MRR_ESPA.h

 #elif EXTRUDERS > 1 || E_STEPPERS > 1
   #error "MRR ESPA only supports one E Stepper. Comment out this line to continue."
 #elif HOTENDS > 1
-  #error "MRR ESPA currently supports only one hotend. Comment out this line to continue."
+  #error "MRR ESPA only supports one hotend / E-stepper. Comment out this line to continue."
 #endif
 
 #define BOARD_INFO_NAME       "MRR ESPA"

Marlin/src/pins/esp32/pins_MRR_ESPE.h

 #elif EXTRUDERS > 2 || E_STEPPERS > 2
   #error "MRR ESPE only supports two E Steppers. Comment out this line to continue."
 #elif HOTENDS > 1
-  #error "MRR ESPE currently supports only one hotend. Comment out this line to continue."
+  #error "MRR ESPE only supports one hotend / E-stepper. Comment out this line to continue."
 #endif
 
 #define BOARD_INFO_NAME      "MRR ESPE"

Marlin/src/pins/stm32f1/pins_CREALITY_V4.h

 #if NOT_TARGET(__STM32F1__)
   #error "Oops! Select an STM32F1 board in 'Tools > Board.'"
 #elif HOTENDS > 1 || E_STEPPERS > 1
-  #error "CREALITY supports up to 1 hotends / E-steppers. Comment out this line to continue."
+  #error "Creality V4 only supports one hotend / E-stepper. Comment out this line to continue."
 #endif
 
 #ifndef BOARD_INFO_NAME

Marlin/src/pins/stm32f1/pins_MKS_ROBIN_E3.h

  */
 
 #if HOTENDS > 1 || E_STEPPERS > 1
-  #error "MKS Robin E3 supports up to 1 hotends / E-steppers. Comment out this line to continue."
+  #error "MKS Robin E3 only supports one hotend / E-stepper. Comment out this line to continue."
 #endif
 
 #ifndef BOARD_INFO_NAME

Marlin/src/pins/stm32f1/pins_MKS_ROBIN_E3D.h

  */
 
 #if HOTENDS > 1 || E_STEPPERS > 1
-  #error "MKS Robin E3D supports up to 1 hotends / E-steppers. Comment out this line to continue."
+  #error "MKS Robin E3D only supports one hotend / E-stepper. Comment out this line to continue."
 #endif
 
 #ifndef BOARD_INFO_NAME

Marlin/src/pins/stm32f1/pins_MKS_ROBIN_E3P.h

 #if NOT_TARGET(__STM32F1__)
   #error "Oops! Select an STM32F1 board in 'Tools > Board.'"
 #elif HOTENDS > 1 || E_STEPPERS > 1
-  #error "MKS Robin e3p supports up to 1 hotends / E-steppers. Comment out this line to continue."
+  #error "MKS Robin E3P only supports one hotend / E-stepper. Comment out this line to continue."
 #elif HAS_FSMC_TFT
-  #error "MKS Robin e3p doesn't support FSMC-based TFT displays."
+  #error "MKS Robin E3P doesn't support FSMC-based TFT displays."
 #endif
 
-#define BOARD_INFO_NAME "MKS Robin e3p"
+#define BOARD_INFO_NAME "MKS Robin E3P"
 
 #define BOARD_NO_NATIVE_USB
 

Marlin/src/pins/stm32f4/pins_BTT_BTT002_V1_0.h

 #if NOT_TARGET(STM32F4)
   #error "Oops! Select an STM32F4 board in 'Tools > Board.'"
 #elif HOTENDS > 1 || E_STEPPERS > 1
-  #error "BIGTREE BTT002 V1.0 supports up to 1 hotends / E-steppers."
+  #error "BIGTREE BTT002 V1.0 only supports one hotend / E-stepper."
 #endif
 
 #define BOARD_INFO_NAME "BTT BTT002 V1.0"

Marlin/src/pins/stm32f4/pins_LERDGE_X.h

 #if NOT_TARGET(STM32F4, STM32F4xx)
   #error "Oops! Select an STM32F4 board in 'Tools > Board.'"
 #elif HOTENDS > 1 || E_STEPPERS > 1
-  #error "LERDGE X supports only one hotend / E-steppers"
+  #error "LERDGE X only supports one hotend / E-steppers"
 #endif
 
 #define BOARD_INFO_NAME      "Lerdge X"

Marlin/src/pins/stm32f7/pins_REMRAM_V1.h

 #endif
 
 #if HOTENDS > 1 || E_STEPPERS > 1
-  #error "RemRam supports only one hotend / E-stepper."
+  #error "RemRam only supports one hotend / E-stepper."
 #endif
 
 //