Correct spelling in Creating platform example
Correct spelling in Creating platform example

jrobeson/platformio,bkudria/platformio,platformio/platformio-core,mplewis/platformio,mseroczynski/platformio,jrobeson/platformio,jrobeson/platformio,eiginn/platformio,bkudria/platformio,jrobeson/platformio,bkudria/platformio,platformio/platformio-core,mcanthony/platformio,dkuku/platformio,atyenoria/platformio,valeros/platformio,ZachMassia/platformio,bkudria/platformio,platformio/platformio