docs: Various typos and witespace fixes in the todo-app tutorial. (fix #182)
docs: Various typos and witespace fixes in the todo-app tutorial. (fix #182)

Thanks rogererens, goldfaber3012, Michael Labbe, Brian Sierakowski and others.

samstav/bottle,wangjun/bottle,SamuelMarks/bottle,fkazimierczak/bottle,mefyl/bottle,wangjun/bottle,SmithSamuelM/bottle,Kjuly/bottle,prologic/bottle,gaotongfei/bottle,myzhan/bottle,bottlepy/bottle,mefyl/bottle,StdioA/bottle,mrdon/bottle,kevintaw/bottle,defnull/bottle,adampresley/bottle,CentricWebEstate/bottle,Inndy/bottle,Inndy/bottle,Kjuly/bottle,ifduyue/bottle,StdioA/bottle,ericfrederich/bottle,xsank/bottle,enzzc/bottle,myzhan/bottle,kevinmel2000/bottle,taisa007/bottle-ja,AWFU/bottle,oz123/bottle,hayate/bottle,enzzc/bottle,CentricWebEstate/bottle,catroot/bottle,ericfrederich/bottle,gaotongfei/bottle,samstav/bottle,oz123/bottle,khirayama/bottle,catroot/bottle,prologic/bottle,mrdon/bottle,SmithSamuelM/bottle,ifduyue/bottle,hkmshb/bottle,fkazimierczak/bottle,ListFranz/bottle,khirayama/bottle,bottlepy/bottle,hkmshb/bottle,hayate/bottle,kevintaw/bottle,adampresley/bottle,taisa007/bottle-ja,SamuelMarks/bottle,kevinmel2000/bottle,defnull/bottle,ListFranz/bottle,AWFU/bottle