docs: Various improvements to the `atuin import` docs (#3062)

Recreation of PR https://github.com/atuinsh/docs/pull/111, after the
migration of the docs to this repo (#3018).

Copying the description from that PR, for convenience:

This PR implements a few improvements to the import doc page.

1. **Fix name of `zsh-hist-db` and `xonsh-sqlite` subcommands**

   The `atuin import` subcommands `zsh-hist-db` and `xonsh-sqlite`
were incorrectly documented as `zsh_histdb` and `xonsh_sqlite`,
respectively.

This is likely due to the actual modules that implement the import
functionality
being indeed named `zsh_histdb` and `xonsh_sqlite` (see
[here](https://github.com/atuinsh/atuin/blob/v18.10.0/crates/atuin/src/command/client/import.rs#L14)
and
[here](https://github.com/atuinsh/atuin/blob/v18.10.0/crates/atuin-client/src/import/mod.rs#L19-L21)),
but for the end-user, that results in documentation that's confusing at
best,
   and error-inducing at worst.

Fixes issue
[atuinsh/atuin#2533](https://github.com/atuinsh/atuin/issues/2533).

2. **Document the `powershell` and `replxx` import subcommands**

These importers were introduced in PRs
[atuinsh/atuin#2864](https://github.com/atuinsh/atuin/pull/2864) and
[atuinsh/atuin#2024](https://github.com/atuinsh/atuin/pull/2024),
respectively,
   but the documentation was not updated to account for them.

3. **Fix alphabetic sorting of sections**

Move the `nu-hist-db` and `zsh-hist-db` sections to be after `nu` and
`zsh`, respectively.
This is more intuitive, and matches the existing sort used for the
`xonsh` / `xonsh-sqlite` sections.

4. **Minor whitespace correction**

   Fix line wrapping in the `resh` section
   ~~and remove trailing whitespace in the `nu*` sections.~~

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## Checks
- [x] I am happy for maintainers to push small adjustments to this PR,
to speed up the review cycle
- [x] I have checked that there are no existing pull requests for the
same thing

Fixes #2533.

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