fix(elisp/org-html-export.el): fix lean-escape-code
fix(elisp/org-html-export.el): fix lean-escape-code

fpvandoorn/tutorial,Hodapp87/cs6460_project,soonhokong/lean-tutorial,avigad/tutorial,cjmazey/fork_leanprover_tutorial,cjmazey/fork_leanprover_tutorial,avigad/tutorial,leanprover/tutorial,cjmazey/fork_leanprover_tutorial,leanprover/tutorial,fpvandoorn/tutorial,soonhokong/lean-tutorial,fpvandoorn/tutorial,Hodapp87/cs6460_project,Hodapp87/cs6460_project,avigad/tutorial,soonhokong/lean-tutorial,leanprover/tutorial