Update SPI.adoc

Fix table cells out of alignment and remove unnecessary cells.

Author: justbennett

Language/Functions/Communication/SPI.adoc

@@ -31,16 +31,16 @@ To read more about Arduino and SPI, you can visit the https://docs.arduino.cc/le
 [#howtouse]
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 |================================================================================================================================================
-|                                                    Boards                                            | Default SPI Pins                            | Additonal SPI Pins | Notes |
-| UNO R3, UNO R3 SMD, UNO WiFi Rev2, UNO Mini Ltd| 10(CS), 11(COPI), 12(CIPO), 13(SCK) | | SPI pins available on ICSP header |
-| UNO R4 Minima, UNO R4 WiFi| 10(CS), 11(COPI), 12(CIPO), 13(SCK) | | SPI pins available on ICSP header |
-| Leonardo, Yún Rev2, Zero| 10(CS), 11(COPI), 12(CIPO), 13(SCK) | | SPI pins available on ICSP header |
-| Micro                | 14(CIPO), 15(SCK), 16(COPI)      | |
+|                                                    Boards                                            | Default SPI Pins                            | Additonal SPI Pins | Notes 
+| UNO R3, UNO R3 SMD, UNO WiFi Rev2, UNO Mini Ltd| 10(CS), 11(COPI), 12(CIPO), 13(SCK) | | SPI pins available on ICSP header 
+| UNO R4 Minima, UNO R4 WiFi| 10(CS), 11(COPI), 12(CIPO), 13(SCK) | | SPI pins available on ICSP header 
+| Leonardo, Yún Rev2, Zero| 10(CS), 11(COPI), 12(CIPO), 13(SCK) | | SPI pins available on ICSP header 
+| Micro                | 14(CIPO), 15(SCK), 16(COPI)      | | 
 | Nano boards          | 11(COPI), 12(CIPO), 13(SCK)      | |
 | MKR boards           | 8(COPI), 9(SCK), 10(CIPO)        | |
-| Due                  | 74(CIPO), 75(MOSI), 76(SCK) | SPI pins available on dedicated SPI header | |
-| GIGA R1 WiFi         | 89(CIPO), 90(COPI), 91(SCK) | 12(CIPO), 11(COPI), 13(SCK), 10(CS) | Note that pin 89,90,91 are located on the SPI header |
-| Mega 2560 Rev3       | 50(CIPO), 51(COPI), 52(SCK), 53(CS) |  | SPI pins available on ICSP header |
+| Due                  | 74(CIPO), 75(MOSI), 76(SCK) | SPI pins available on dedicated SPI header |  
+| GIGA R1 WiFi         | 89(CIPO), 90(COPI), 91(SCK) | 12(CIPO), 11(COPI), 13(SCK), 10(CS) | Note that pin 89,90,91 are located on the SPI header 
+| Mega 2560 Rev3       | 50(CIPO), 51(COPI), 52(SCK), 53(CS) |  | SPI pins available on ICSP header 
 |================================================================================================================================================
 
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