docs: fix typos in hacking guide.
docs: fix typos in hacking guide.

joshix/rkt,kinvolk/rkt,kinvolk/rkt,Shashwatsh/rkt,nhlfr/rkt,monstermunchkin/rkt,markllama/rkt,nhlfr/rkt,kinvolk/rkt,lucasallan/rkt,sstabellini/rkt,yifan-gu/rkt,yifan-gu/rkt,euank/rkt,matthaias/rkt,jonboulle/rkt,rkt/rkt,dgonyeo/rkt,shobhit85/rkt,jakon89/rkt,euank/rkt,shobhit85/rkt,joshix/rkt,ybubnov/rkt,sstabellini/rkt,cab105/rkt,akshaykarle/rkt,sgotti/rkt,jakon89/rkt,Wilybald/rkt,tmrts/rkt,s-urbaniak/rkt,Shashwatsh/rkt,mike1729/rkt,yifan-gu/rkt,Shashwatsh/rkt,yifan-gu/rocket,mike1729/rkt,jjlakis/rkt,intelsdi-x/rkt,jjlakis/rkt,alban/rkt,squeed/rkt,cab105/rkt,akshaykarle/rkt,squeed/rkt,dgonyeo/rkt,lucasallan/rkt,squeed/rkt,coreos/rkt,lucasallan/rkt,tmrts/rkt,sgotti/rkt,dgonyeo/rkt,monstermunchkin/rkt,coreos/rkt,intelsdi-x/rkt,kinvolk/rkt,rkt/rkt,matthaias/rkt,shobhit85/rkt,alban/rkt,markllama/rkt,cab105/rkt,achanda/rkt,intelsdi-x/rkt,sgotti/rkt,joshix/rkt,markllama/rkt,s-urbaniak/rkt,joshix/rkt,lucasallan/rkt,yifan-gu/rocket,Wilybald/rkt,alban/rkt,sstabellini/rkt,achanda/rkt,matthaias/rkt,Wilybald/rkt,mike1729/rkt,jakon89/rkt,Wilybald/rkt,coreos/rkt,s-urbaniak/rkt,jjlakis/rkt,yifan-gu/rocket,rkt/rkt,jonboulle/rkt,monstermunchkin/rkt,tmrts/rkt,achanda/rkt,jonboulle/rkt,akshaykarle/rkt,nhlfr/rkt,ybubnov/rkt,euank/rkt,rkt/rkt,ybubnov/rkt