Fix typo in initial size comment
Fix typo in initial size comment

michelleN/docs,bq-xiao/docs,jonboulle/docs,hkjn/docs-1,iankronquist/docs,mjg59/docs,skynet/docs,ksmaheshkumar/docs-2,wli6/docs,ionave/docs,marineam/coreos-docs,coreos/docs,jdloft/docs,atxwebs/docs,mischief/coreos-docs,robszumski/docs,joshix/docs,endocode/coreos-docs