frdm_k64f: Fix pin name typos in the board doc
frdm_k64f: Fix pin name typos in the board doc

The frdm_k64f board document incorrectly listed spi signals on PTCD
pins, which don't exist. They should be on PTD pins.

Signed-off-by: Maureen Helm <87a696db5547fa477bda9f9e0f00013c839c14d3@nxp.com>

zephyrproject-rtos/zephyr,explora26/zephyr,finikorg/zephyr,GiulianoFranchetto/zephyr,ldts/zephyr,finikorg/zephyr,punitvara/zephyr,ldts/zephyr,finikorg/zephyr,mbolivar/zephyr,GiulianoFranchetto/zephyr,ldts/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,nashif/zephyr,zephyriot/zephyr,nashif/zephyr,finikorg/zephyr,finikorg/zephyr,kraj/zephyr,kraj/zephyr,galak/zephyr,mbolivar/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,punitvara/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,nashif/zephyr,mbolivar/zephyr,galak/zephyr,explora26/zephyr,Vudentz/zephyr,ldts/zephyr,explora26/zephyr,punitvara/zephyr,zephyrproject-rtos/zephyr,zephyriot/zephyr,nashif/zephyr,nashif/zephyr,zephyriot/zephyr,explora26/zephyr,Vudentz/zephyr,kraj/zephyr,GiulianoFranchetto/zephyr,galak/zephyr,Vudentz/zephyr,kraj/zephyr,zephyriot/zephyr,kraj/zephyr,mbolivar/zephyr,punitvara/zephyr,Vudentz/zephyr,punitvara/zephyr,galak/zephyr,mbolivar/zephyr,zephyrproject-rtos/zephyr,zephyriot/zephyr,explora26/zephyr