Some release note improvements

[dstansby]

Some minor improvements to the release notes:

• Fix one of the filenames
• Split out one of the big release notes into lots of smaller release notes. (from Improve test coverage for storage classes #2693) This should make them render nicely in the release notes listing.

[d-v-b]

• This should make them render nicely in the release notes listing.

how can we preview this?

[joshmoore]

how can we preview this?

You mean locally or for a PR? If the latter 👉🏽 https://zarr--2775.org.readthedocs.build/en/2775/release-notes.html

[dstansby]

click on details next to readthedocs below:

and then the release notes will be shown on the release notes page as if they were rendered for a release.

[d-v-b]

how can we preview this?

You mean locally or for a PR? If the latter 👉🏽 https://zarr--2775.org.readthedocs.build/en/2775/release-notes.html

nice!