Backslash breaking project URL auto linking in `LICENSE.md`

[mbrukman]

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The URL pointing to another project in LICENSE.md is broken:

https://github.com/graphdeco-inria/gaussian-splatting/blob/54c035f7834b564019656c3e3fcc3646292f727d/LICENSE.md?plain=1#L89

which renders as:

Project code: https://github.com/Po-Hsun-Su/pytorch-ssim\

causing the broken link.

The easy solution here is to add a blank space between the URL and the backslash, though since this is in Markdown, the backslashes aren't necessary here (unclear what purpose they serve), and an alternative option to group text with URLs is to use bullet points.