docs/why: small text improvements
docs/why: small text improvements

Also linking issues to stuff we don't have but plan to.

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