Minor updates to http_apis.md
Minor updates to http_apis.md

google/keytransparency,alsophian/keytransparency,gdbelvin/keytransparency,alsophian/keytransparency,AMarcedone/keytransparency,google/keytransparency,cesarghali/keytransparency,gdbelvin/keytransparency,cesarghali/keytransparency,AMarcedone/keytransparency