(PDB-1571) update release notes for 2.3.5 release
(PDB-1571) update release notes for 2.3.5 release

this updates our release notes for 2.3.5

rbrw/puppetdb,kbarber/puppetdb,puppetlabs/puppetdb,shrug/puppetdb,mullr/puppetdb,ajroetker/puppetdb,mullr/puppetdb,waynr/puppetdb,shrug/puppetdb,mullr/puppetdb,grimradical/puppetdb,rbrw/puppetdb,kbrezina/puppetdb,ajroetker/puppetdb,kbarber/puppetdb,kbrezina/puppetdb,highb/puppetdb,wkalt/puppetdb,wkalt/puppetdb,highb/puppetdb,puppetlabs/puppetdb,waynr/puppetdb,puppetlabs/puppetdb,senior/puppetdb,grimradical/puppetdb,grimradical/puppetdb,highb/puppetdb,kbarber/puppetdb,wkalt/puppetdb,rbrw/puppetdb,wkalt/puppetdb,waynr/puppetdb,grimradical/puppetdb,kbrezina/puppetdb,mullr/puppetdb,senior/puppetdb,senior/puppetdb,shrug/puppetdb,rbrw/puppetdb,puppetlabs/puppetdb,ajroetker/puppetdb,highb/puppetdb,puppetlabs/puppetdb,waynr/puppetdb,mullr/puppetdb,rbrw/puppetdb,ajroetker/puppetdb,kbrezina/puppetdb,senior/puppetdb,kbarber/puppetdb,shrug/puppetdb