Fixed some typos in tables.js (#326)
Fixed some typos in tables.js (#326)

Looks like these comments were supposed to reference tables instead of datasets.
JustinBeckwith/nodejs-docs-samples,thesandlord/nodejs-docs-samples,srijangulati/sierracartel,srijangulati/sierracartel,GoogleCloudPlatform/nodejs-docs-samples,srijangulati/sierracartel,thesandlord/nodejs-docs-samples,JustinBeckwith/nodejs-docs-samples,JustinBeckwith/nodejs-docs-samples,GoogleCloudPlatform/nodejs-docs-samples,GoogleCloudPlatform/nodejs-docs-samples,GoogleCloudPlatform/nodejs-docs-samples