Fixes doc typos. Removes unnecessary checks from notebook data getOrThrow operations
Fixes doc typos. Removes unnecessary checks from notebook data getOrThrow operations

googledatalab/datalab,googledatalab/datalab,googledatalab/datalab,yebrahim/datalab,yebrahim/datalab,parthea/datalab,craigcitro/datalab,yebrahim/datalab,parthea/datalab,parthea/datalab,googledatalab/datalab,craigcitro/datalab,googledatalab/datalab,craigcitro/datalab,parthea/datalab,yebrahim/datalab,googledatalab/datalab,parthea/datalab,parthea/datalab,yebrahim/datalab,craigcitro/datalab,craigcitro/datalab