in doc dashboard, a few typos corrected and a todo fixed
in doc dashboard, a few typos corrected and a todo fixed

sky-xu/deepdive,shahin/deepdive,HazyResearch/deepdive,HazyResearch/deepdive,HazyResearch/deepdive,sky-xu/deepdive,HazyResearch/deepdive,shahin/deepdive