Fix sentence "we will the" (#3904)
Fix sentence "we will the" (#3904)

* Fix sentence

* Update testing.md

Co-authored-by: José Valim <0c2436ea76ed86e37cc05f66dea18d48ef390882@gmail.com>
0x00evil/phoenix,optikfluffel/phoenix,phoenixframework/phoenix,0x00evil/phoenix,rafbgarcia/phoenix,michalmuskala/phoenix,optikfluffel/phoenix,eksperimental/phoenix,rafbgarcia/phoenix,rafbgarcia/phoenix,0x00evil/phoenix,phoenixframework/phoenix,nshafer/phoenix,optikfluffel/phoenix,eksperimental/phoenix,michalmuskala/phoenix,nshafer/phoenix,phoenixframework/phoenix,nshafer/phoenix