ByAltText examples seem incorrect

[bjohn465]

Describe the bug
The example for ByAltText uses the following example markup:

<img alt="Incredibles 2 Poster" src="/incredibles-2.png" />

The examples pass /incredibles.*png$/i to getByAltText, which seems incorrect. If we're trying to find the element by the value of the alt attribute, why would we include png$ in the regular expression, since that's part of the src attribute and not the alt attribute?

To Reproduce
Steps to reproduce the behavior:

1. Go to https://testing-library.com/docs/dom-testing-library/api-queries#byalttext
2. Scroll down to the ByAltText example, if it isn't already visible
3. Look at the example code

Expected behavior
I would expect the example to use "Incredibles 2 Poster", /incredibles/i, or something without the "png" as the argument to getByAltText.

If /incredibles.*png$/i is somehow correct, then perhaps a note explaining why that works would be helpful.

Screenshots

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Smartphone (please complete the following information):
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Additional context
I haven't used this library yet, so maybe /incredibles.*png$/i is perfectly valid here. If it is, it is confusing, though.

[kentcdodds]

You're right. That example is wrong. Would you be willing to update it?

[bjohn465]

I could put a pull request together.