Update validate_form.md
Update validate_form.md

fix typos
kikocorreoso/brython,molebot/brython,brython-dev/brython,Isendir/brython,JohnDenker/brython,amrdraz/brython,olemis/brython,jonathanverner/brython,firmlyjin/brython,molebot/brython,Isendir/brython,JohnDenker/brython,kevinmel2000/brython,rubyinhell/brython,Lh4cKg/brython,firmlyjin/brython,firmlyjin/brython,kevinmel2000/brython,Lh4cKg/brython,jonathanverner/brython,Isendir/brython,kikocorreoso/brython,olemis/brython,Mozhuowen/brython,kevinmel2000/brython,brython-dev/brython,Hasimir/brython,jonathanverner/brython,rubyinhell/brython,molebot/brython,rubyinhell/brython,amrdraz/brython,olemis/brython,JohnDenker/brython,Mozhuowen/brython,Isendir/brython,kevinmel2000/brython,JohnDenker/brython,Mozhuowen/brython,kikocorreoso/brython,rubyinhell/brython,brython-dev/brython,molebot/brython,olemis/brython,Hasimir/brython,Hasimir/brython,amrdraz/brython,Lh4cKg/brython,jonathanverner/brython,amrdraz/brython,firmlyjin/brython,Hasimir/brython,Mozhuowen/brython,firmlyjin/brython,Lh4cKg/brython