doc: make the LED example unambiguous
doc: make the LED example unambiguous

gale320/embd,gavincabbage/embd,pctj101/embd,pctj101/embd,kidoman/embd,dboyliao/embd,ryancox/embd,gale320/embd,dboyliao/embd,gavincabbage/embd,ryancox/embd,kidoman/embd