Correct `files` to `file` in sentence
Correct `files` to `file` in sentence

gavboulton/govuk_elements,alphagov/govuk_elements,joelanman/govuk_elements,gavboulton/govuk_elements,joelanman/govuk_elements,TFOH/govuk_elements,alphagov/govuk_elements,gavboulton/govuk_elements,alphagov/govuk_elements,TFOH/govuk_elements,gavboulton/govuk_elements,alphagov/govuk_elements