platform doc: Fix build warnings caused by unicode
platform doc: Fix build warnings caused by unicode

Fixes multiple instances of the following build warning by updating the
platform documentation to no longer use a unicode equivalent to the ' character.

   WARNING: undecodable source characters, replacing with "?"

Change-Id: I226176cc4699be79692a3591c7b53772df6d1bef
Signed-off-by: Peter Mitsis <22bf95476f8cdbda3c8a9a9bf1bdda876f69ea7a@windriver.com>

kraj/zephyr,punitvara/zephyr,aceofall/zephyr-iotos,fractalclone/zephyr-riscv,zephyriot/zephyr,aceofall/zephyr-iotos,fbsder/zephyr,holtmann/zephyr,bboozzoo/zephyr,nashif/zephyr,explora26/zephyr,fbsder/zephyr,GiulianoFranchetto/zephyr,punitvara/zephyr,erwango/zephyr,galak/zephyr,zephyriot/zephyr,holtmann/zephyr,mirzak/zephyr-os,rsalveti/zephyr,punitvara/zephyr,jamesonwilliams/zephyr-kernel,kraj/zephyr,32bitmicro/zephyr,ldts/zephyr,mirzak/zephyr-os,finikorg/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,32bitmicro/zephyr,rsalveti/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,runchip/zephyr-cc3220,mirzak/zephyr-os,zephyriot/zephyr,explora26/zephyr,bboozzoo/zephyr,zephyrproject-rtos/zephyr,runchip/zephyr-cc3220,zephyrproject-rtos/zephyr,zephyriot/zephyr,tidyjiang8/zephyr-doc,mirzak/zephyr-os,erwango/zephyr,nashif/zephyr,tidyjiang8/zephyr-doc,pklazy/zephyr,kraj/zephyr,32bitmicro/zephyr,rsalveti/zephyr,galak/zephyr,aceofall/zephyr-iotos,finikorg/zephyr,runchip/zephyr-cc3200,fractalclone/zephyr-riscv,explora26/zephyr,runchip/zephyr-cc3200,jamesonwilliams/zephyr-kernel,Vudentz/zephyr,sharronliu/zephyr,aceofall/zephyr-iotos,bboozzoo/zephyr,fractalclone/zephyr-riscv,bigdinotech/zephyr,finikorg/zephyr,galak/zephyr,runchip/zephyr-cc3220,GiulianoFranchetto/zephyr,ldts/zephyr,bboozzoo/zephyr,pklazy/zephyr,fractalclone/zephyr-riscv,ldts/zephyr,sharronliu/zephyr,erwango/zephyr,mbolivar/zephyr,runchip/zephyr-cc3220,tidyjiang8/zephyr-doc,galak/zephyr,rsalveti/zephyr,Vudentz/zephyr,coldnew/zephyr-project-fork,erwango/zephyr,fractalclone/zephyr-riscv,sharronliu/zephyr,GiulianoFranchetto/zephyr,Vudentz/zephyr,Vudentz/zephyr,ldts/zephyr,explora26/zephyr,kraj/zephyr,coldnew/zephyr-project-fork,fbsder/zephyr,mbolivar/zephyr,runchip/zephyr-cc3200,explora26/zephyr,pklazy/zephyr,zephyriot/zephyr,fbsder/zephyr,coldnew/zephyr-project-fork,runchip/zephyr-cc3220,32bitmicro/zephyr,punitvara/zephyr,bigdinotech/zephyr,mbolivar/zephyr,mirzak/zephyr-os,bigdinotech/zephyr,finikorg/zephyr,bigdinotech/zephyr,fbsder/zephyr,sharronliu/zephyr,runchip/zephyr-cc3200,nashif/zephyr,32bitmicro/zephyr,aceofall/zephyr-iotos,punitvara/zephyr,kraj/zephyr,jamesonwilliams/zephyr-kernel,coldnew/zephyr-project-fork,pklazy/zephyr,mbolivar/zephyr,rsalveti/zephyr,tidyjiang8/zephyr-doc,sharronliu/zephyr,ldts/zephyr,jamesonwilliams/zephyr-kernel,jamesonwilliams/zephyr-kernel,GiulianoFranchetto/zephyr,nashif/zephyr,pklazy/zephyr,mbolivar/zephyr,bigdinotech/zephyr,runchip/zephyr-cc3200,bboozzoo/zephyr,GiulianoFranchetto/zephyr,erwango/zephyr,Vudentz/zephyr,holtmann/zephyr,holtmann/zephyr,galak/zephyr,tidyjiang8/zephyr-doc,Vudentz/zephyr,coldnew/zephyr-project-fork,holtmann/zephyr