NO, the original wiring is correct and it matches all documents (two above) and what you say below.
When reading http://www.sparkfun....ter/ADXL345.pdf page 8 Figure 4. 4, I see:
/CS (pin 7 on the ADXL345, which must to a random GPIO for Netduino indeed)
SDI (also known as SDA/SDIO, pin 13 on the ADXL345, which must go to netduino MOSI; Netduino pin D11)
SDO (also known as ALT ADDRESS, pin 12 on the ADXL345, which must go to netduino MISO; Netduino pin D12)
SCLK (also known as SCL, pin 14 on the ADXL345, which must go to netduino SPCK; Netduino pin D13)
So you switched pins 11 and 12.