Update description of check for drivers list

[kattni]

We moved the drivers.rst file to the docs in the Bundle from the core. The description of the validator currently reads CircuitPython drivers page missing driver and could be clearer.

[evaherrada]

Do you know if that would support html? I was thinking of just having 'circuitpython drivers page' link to drivers.rst

[kattni]

@dherrada Even if you have it link, the description should be clearer. I don't know if it would support HTML.

[evaherrada]

Ok

[sommersoft]

@dherrada there are 2 places that currently use the validator functions and subsequently output this message:

• The daily reports that output to a raw text file.
• The JSON file that circuitpython.org/contributing uses.

Both are uploaded to S3. I suppose that circuitpython.org/contributing would render an HTML-formatted anchor. The daily reports are read by very few people, I assume, so it shouldn't be too "disruptive" to have the anchor element included.