Update 2017-08-08-redshift-best-practices.md
Update 2017-08-08-redshift-best-practices.md

Fix some typos and mistakes
SLangevin/source.coveo.com,amoreauCoveo/source.coveo.com,acverrette/source.coveo.com,Coveo/source.coveo.com,amoreauCoveo/source.coveo.com,jflheureux/source.coveo.com,jflheureux/source.coveo.com,Coveo/source.coveo.com,Coveo/source.coveo.com,malaporte/source.coveo.com,acverrette/source.coveo.com,Coveo/coveo.github.io,malaporte/source.coveo.com,Coveo/coveo.github.io,SLangevin/source.coveo.com