Update concepts.js
Update concepts.js

Making this code snippet consistent with the corresponding docs and all the rest of the instances of 'sampleTask' in this file.
srijangulati/sierracartel,pcostell/nodejs-docs-samples,GoogleCloudPlatform/nodejs-docs-samples,thesandlord/nodejs-docs-samples,GoogleCloudPlatform/nodejs-docs-samples,srijangulati/sierracartel,JustinBeckwith/nodejs-docs-samples,kydev1986/nodejs-docs-samples,JustinBeckwith/nodejs-docs-samples,thesandlord/nodejs-docs-samples,srijangulati/sierracartel,pcostell/nodejs-docs-samples,GoogleCloudPlatform/nodejs-docs-samples,kydev1986/nodejs-docs-samples,GoogleCloudPlatform/nodejs-docs-samples,JustinBeckwith/nodejs-docs-samples