docs(ngMock): fix typo providers -> provides
docs(ngMock): fix typo providers -> provides

Should be a verb, ☆.。.：・゜☆MERCI BEAUCOUP☆.。.：・゜☆

Closes #7852

ggershoni/angular.js,ggershoni/angular.js,ggershoni/angular.js,ggershoni/angular.js