docs: update contributing guide grammar (#36313)
docs: update contributing guide grammar (#36313)


raisedadead/FreeCodeCamp,BhaveshSGupta/FreeCodeCamp,BhaveshSGupta/FreeCodeCamp,BhaveshSGupta/FreeCodeCamp,FreeCodeCamp/FreeCodeCamp,raisedadead/FreeCodeCamp,jonathanihm/freeCodeCamp,jonathanihm/freeCodeCamp,FreeCodeCamp/FreeCodeCamp