docs: fix sql templating typos (#18955)
docs: fix sql templating typos (#18955)


zhouyao1994/incubator-superset,zhouyao1994/incubator-superset,zhouyao1994/incubator-superset,zhouyao1994/incubator-superset,airbnb/caravel,airbnb/caravel,zhouyao1994/incubator-superset,airbnb/caravel,airbnb/caravel