Markdownlint fixes

[mdo]

Addresses some Markdown linting found from testing out markdownlint in #29919.

[XhmikosR]

@mdo did you use my branch https://github.com/twbs/bootstrap/tree/master-xmr-markdownlint? Because there are false positives Markdownlint cannot handle hence why I haven't made a PR to actually add Markdownlint.

EDIT: here's the upstream issue DavidAnson/markdownlint#249

[mdo]

I didn't use your branch—I use markdownlint at GitHub and just ran the CLI against our docs to clear out the easy wins. There are tons of false positives due to our docs tags and what not.

[XhmikosR]

I'm not sure if "OC Sponsor" is better than nothing. @patrickhlauke

[patrickhlauke]

so i take it there's no way for us to somehow get that pulled in via third party or something and have it provided with more accurate alt etc? (like a validation badge or similar that actually gets generated separately and dynamically pulled in)

if not, then...yeah, better than nothing i guess

[XhmikosR]

Unfortunately, I'm not aware of a way. But perhaps we should use OC sponsor 1 etc?

[patrickhlauke]

i guess you could. that would still not provide the equivalent of what sponsor it is, but i guess it would at least indicate it's not always the same image. least worst fix, probably

[XhmikosR]

There are tons of false positives due to our docs tags and what not.

I have disabled some rules in my branch https://github.com/twbs/bootstrap/runs/589127421#step:9:235

[mdo]

To clarify, this isn't meant to add a script or Action anywhere—it's just cleaning up some Markdown :). I'll defer to another PR for implementing it and running it as a check for us everywhere.

[XhmikosR]

To clarify, this isn't meant to add a script or Action anywhere

I know, just trying to get the best of the two branches :)

So, you prefer a - for ul style?

That being said, let's wait to hear about the alt change from @patrickhlauke. Personally I just ignored these specific errors in README.md in my branch and allowed them everywhere else.

[XhmikosR]

@patrickhlauke friendly ping :)