Fixed max-lines property description typo

[collinoc]

As per the title, this just fixes a small typo in the description of the max-lines property to say "max-lines" instead of "max-liens".

[yume-chan]

You should fix here then re-generate

https://github.com/microsoft/vscode-custom-data/blob/7f8ead10d2a7f53a8def5b8ac4c55b86f3e57390/web-data/css/mdn/mdn-documentation.js#L104

[ghost]

All CLA requirements met.

[aeschli]

Thanks @collinoc !