SPDX License expression link broken

[RossSmyth]

Problem

In the Cargo Book, the "SPDX 2.1 license expression" link is broken.

cargo/src/doc/src/reference/manifest.md

Lines 261 to 262 in b27f203

	[crates.io] interprets the `license` field as an [SPDX 2.1 license
	expression][spdx-2.1-license-expressions]. The name must be a known license

cargo/src/doc/src/reference/manifest.md

Line 631 in b27f203

[spdx-2.1-license-expressions]: https://spdx.org/spdx-specification-21-web-version#h.jxpfx0ykyb60

Steps

1. Go to Cargo Book webpage
2. Click on "SPDX 2.1 license expression"
3. See "Page not found" page

Possible Solution(s)

Update the link or complain to SPDX as it looks like the link is broken on their website too

https://spdx.dev/spdx-specification-21-web-version/

So an issue may need to be raised here:

https://github.com/spdx/LicenseListPublisher

Notes

No response

Version

b27f203e7f461a6e98bf78abc88d7e7fc6ff1a8f ?

[weihanglo]

Looking at crates.io project, it uses spdx#0.10.2, which at least uses SPDX license expression v2.1 or later.

v2.3 looks like to have the same syntax as v2.1, though I am not knowledgeable enough to tell the difference.

cc @Turbo87, any insight?

[Turbo87]

interestingly the link to the license expressions in the https://github.com/EmbarkStudios/spdx README is also broken, but AFAIK the syntax is the same as before and only the list of licenses was updated.

even more funny, the link to the 2.1 spec on https://spdx.dev/use/specifications/ is also broken 😅

[weihanglo]

Should we just link them to 2.3, as they are quite the same thing? I would love to let you or crates.io team decide as this is more concerned about crates.io

[Turbo87]

yeah, I guess updating the link to the latest spec should probably be fine