Doc encouraging user to use `title` instead of `aria-label`

[Grsmto]

Hi,

Problem description:

The documentation gives the following statement: The title attribute is usually more accessible by screen readers than mouse/visual users. However the official W3C WAI tutorial says pretty much the exact opposite:
[The title attribute] is generally less reliable [than aria-] and not recommended because some screen readers and assistive technologies do not interpret the title attribute as a replacement for the label element, possibly because the title attribute is often used to provide non-essential information.

Suggested solution:

From what I understand of the WAI tutorial, the aria-label approach is better for accessibility (screen-readers) than the title as that one might be ignored. The doc at the moment seems like encouraging the user to use title instead of aria- which might lead to bad practices.
However I read #16 but I'm not sure to understand what has been agreed on regarding usage of aria- and selectors. As there is a built-in getByTitle but no built-in selectors for aria- attributes.

Thanks!

[alexkrolick]

That statement was meant to reflect this:

The title attribute is not visible on the screen except when hovering, but is read by assistive technology. So selecting by title is less representative of how a sighted user would find elements. Label tags and aria-label are visible on screen and read out by a assistive technology.

Feel free to open a PR in the docs to improve the phrasing (issues are also welcome over there).

[kentcdodds]

Moved to testing-library/testing-library-docs#38