Fix broken markdown in Windows-specific docs.

[maleadt]

The URLs are currently detached, see https://github.com/JuliaLang/julia/blob/cb9acf5b938151cd2b3f1df4056745f9fe8b0644/doc/src/devdocs/build/windows.md#compiling-with-mingwmsys2. Introduced by #42581.

[fredrikekre]

Huh, the Markdown stdlib doesn't understand this version, hence why I updated them, but looks like GitHub behaves the opposite. I guess the only way to make it work on both is to put it all on a single line.

[maleadt]

OK, I've reflowed them such that ](...) always occurs on a single line (which is what VSCode makes of it by default). Still renders OK in GitHub, https://github.com/JuliaLang/julia/blob/fe1bcec239e002e3c5ae4798d5d430f0383a2997/doc/src/devdocs/build/windows.md, and also seems to works fine with Markdown.parse.

[DilumAluthge]

You won't be able to merge this because:

1. The whitespace check is required for merging to master. (This is useful because, for example, it prevents people from accidentally committing directly to master.)
2. Your commit message has "ci skip" in it, so Buildkite won't start.

Either push a commit that doesn't have "ci skip", or amend your last commit and remove "ci skip" from the commit message.

[maleadt]

That's a waste of CI time, but OK. I'll amend the commit.

[DilumAluthge]

@maleadt @staticfloat What do you think the best way forward here is? I like having the whitespace check as a required check, because it keeps people from accidentally committing directly to master.

Personally, I would rather waste a bit of CI time (by telling people they can't do [ci skip]) instead of removing the whitespace check from the list of required checks.

[fredrikekre]

Back in the Travis days we had this: #27356

[DilumAluthge]

Back in the Travis days we had this: #27356

I'll look into this further.