docs/reference/api: some small improvements
docs/reference/api: some small improvements

We're not going to fix it for this release, but I want to ensure that
there isn't anything wrong in page page.

ArxdSilva/tsuru,ggarnier/tsuru,firebitsbr/tsuru,tsuru/tsuru,gwmoura/tsuru,jblancett/tsuru,gciotta/tsuru,ggarnier/tsuru,hcxiong/tsuru,cezarsa/tsuru,cezarsa/tsuru,cgvarela/tsuru,tuxmonteiro/tsuru,guilhermebr/tsuru,tsuru/tsuru,ggarnier/tsuru,guilhermebr/tsuru,ArxdSilva/tsuru,gciotta/tsuru,gwmoura/tsuru,kgrvamsi/tsuru,RichardKnop/tsuru,guilhermebr/tsuru,gwmoura/tsuru,ggarnier/tsuru,gciotta/tsuru,ArxdSilva/tsuru,cgvarela/tsuru,Endika/tsuru,cezarsa/tsuru,hcxiong/tsuru,kgrvamsi/tsuru,firebitsbr/tsuru,tsuru/tsuru,cgvarela/tsuru,hcxiong/tsuru,firebitsbr/tsuru,4eek/tsuru,Endika/tsuru,4eek/tsuru,4eek/tsuru,Endika/tsuru,ArxdSilva/tsuru,mderaldo/tsuru,cezarsa/tsuru,RichardKnop/tsuru,tuxmonteiro/tsuru,tuxmonteiro/tsuru,jblancett/tsuru,tsuru/tsuru,mderaldo/tsuru,RichardKnop/tsuru,guilhermebr/tsuru,kgrvamsi/tsuru,jblancett/tsuru,mderaldo/tsuru