docs(tutorial/step_4: update test to match new $bindings behaviour

var phoneNameColumn = element.all(by.repeater('phone in phones').column('{{phone.name}}'));
should be
var phoneNameColumn = element.all(by.repeater('phone in phones').column('phone.name'));

Closes #9823
docs($browser): minor docs fixes

Remove obsolete `XHR` param from the docs and correct `$log` param
description.