- [x] Add links to information people are going to want to know when adding license
information to their packages (namely OSI licenses and SPDX identifiers).
- [x] Update the packaging docs for `license()` with Spack as an example for `when=`.
After all, it's a dual-licensed package that changed once in the past.
- [x] Add link to https://spdx.org/licenses/ in the `spack create` boilerplate as well.
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