API: Dead links in Changeset Comments resource (BB-8599)

content_rendered field used to have links to changesets (hash) and issues (#

) in relative format starting with / and there was missing only https://bitbucket.org prefix. Now you have added a new prefix https://api.bitbucket.org/ to these links even though they are not valid API links, e.g. they lack 1.0/. It seems that you only need to remove api. subdomain from them.