docs: add ’to’ in “how it works”.
docs: add ’to’ in “how it works”.

fix a typo, changing ‘..sending a signal the testing server to inform..’, into ‘..sending a signal *to* the testing server to inform..’

Closes #980

johnjbarton/karma,gayancliyanage/karma,codedogfish/karma,yandex-lego/karma,skycocker/karma,growlybear/karma,sylvain-hamel/karma,SamuelMarks/karma,pedrotcaraujo/karma,brianmhunt/karma,stevemao/karma,dmitriiabramov/karma,r3mi/karma,nmalaguti/karma,xiaoking/karma,vtsvang/karma,rgaskill/karma,yandex-lego/karma,brianmhunt/karma,kahwee/karma,IveWong/karma,youprofit/karma,Dignifiedquire/karma,yandex-lego/karma,marthinus-engelbrecht/karma,powerkid/karma,pmq20/karma,johnjbarton/karma,astorije/karma,ijobling/karma,sylvain-hamel/karma,Dignifiedquire/karma,chrisirhc/karma,pedrotcaraujo/karma,pmq20/karma,Basemm/karma,adamnation/karma,Klaudit/karma,timebackzhou/karma,harme199497/karma,rgaskill/karma,rageshkrishna/karma,oyiptong/karma,clbond/karma,behzad88/karma,vojtajina/karma,unional/karma,panrafal/karma,codedogfish/karma,shirish87/karma,maksimr/karma,karma-runner/karma,panrafal/karma,growlybear/karma,Basemm/karma,adamnation/karma,vtsvang/karma,simudream/karma,shirish87/karma,maksimr/karma,SamuelMarks/karma,buley/karma,rageshkrishna/karma,hitesh97/karma,ijobling/karma,bitwiseman/karma,david-garcia-nete/karma,jsdir/karma,maksimr/karma,karma-runner/karma,swayf/karma,clbond/karma,gayancliyanage/karma,jeffjewiss/karma,wesleycho/karma,lencioni/karma,jamestalmage/karma,hitesh97/karma,ernsheong/karma,Klaudit/karma,IveWong/karma,nmalaguti/karma,xiaoking/karma,jsdir/karma,kahwee/karma,nmalaguti/karma,pedrotcaraujo/karma,jjoos/karma,hitesh97/karma,vojtajina/karma,IveWong/karma,swayf/karma,Sanjo/karma,buley/karma,oyiptong/karma,youprofit/karma,clbond/karma,pedrotcaraujo/karma,tomkuk/karma,unional/karma,sylvain-hamel/karma,timebackzhou/karma,pedrosnk/karma,jamestalmage/karma,cironunes/karma,gayancliyanage/karma,Klaudit/karma,ernsheong/karma,bitwiseman/karma,rgaskill/karma,jamestalmage/karma,stevemao/karma,astorije/karma,karma-runner/karma,ijobling/karma,kahwee/karma,chrisirhc/karma,mprobst/karma,marthinus-engelbrecht/karma,wesleycho/karma,powerkid/karma,jacopotarantino/karma,KrekkieD/karma,dmitriiabramov/karma,jeffjewiss/karma,behzad88/karma,Dignifiedquire/karma,rageshkrishna/karma,pmq20/karma,vojtajina/karma,buley/karma,timebackzhou/karma,gayancliyanage/karma,stevemao/karma,david-garcia-nete/karma,Klaudit/karma,simudream/karma,adamnation/karma,growlybear/karma,pedrosnk/karma,tomkuk/karma,jeffjewiss/karma,patrickporto/karma,aiboy/karma,shirish87/karma,Sanjo/karma,chrisirhc/karma,IsaacChapman/karma,dmitriiabramov/karma,panrafal/karma,unional/karma,astorije/karma,harme199497/karma,lencioni/karma,jjoos/karma,nmalaguti/karma,skycocker/karma,harme199497/karma,skycocker/karma,johnjbarton/karma,jacopotarantino/karma,behzad88/karma,cironunes/karma,pmq20/karma,jsdir/karma,KrekkieD/karma,kahwee/karma,patrickporto/karma,youprofit/karma,Sanjo/karma,aiboy/karma,thomasboyt/karma,brianmhunt/karma,karma-runner/karma,mprobst/karma,codedogfish/karma,IsaacChapman/karma,simudream/karma,wesleycho/karma,stevemao/karma,unional/karma,patrickporto/karma,marthinus-engelbrecht/karma,powerkid/karma,harme199497/karma,xiaoking/karma,wesleycho/karma,simudream/karma,vtsvang/karma,clbond/karma,david-garcia-nete/karma,brianmhunt/karma,ernsheong/karma,Sanjo/karma,rhlass/karma,rhlass/karma,jamestalmage/karma,marthinus-engelbrecht/karma,rhlass/karma,Dignifiedquire/karma,aiboy/karma,SamuelMarks/karma,jjoos/karma,xiaoking/karma,skycocker/karma,lencioni/karma,IsaacChapman/karma,youprofit/karma,IveWong/karma,codedogfish/karma,oyiptong/karma,bitwiseman/karma,IsaacChapman/karma,tomkuk/karma,hitesh97/karma,patrickporto/karma,mprobst/karma,powerkid/karma,astorije/karma,KrekkieD/karma,thomasboyt/karma,oyiptong/karma,tomkuk/karma,jjoos/karma,johnjbarton/karma,vtsvang/karma,aiboy/karma,buley/karma,r3mi/karma,rhlass/karma,timebackzhou/karma,KrekkieD/karma,pedrosnk/karma,chrisirhc/karma