Add an example of `catalog.list(<regex>)` and replace `io` to `catalog` in docs

Description

It appears that catalog.list(<regex>)" is not really known by our users. I search our docs and there is no mention of it. The first step is to add an example here, then we can further improve the searching feature if we decide to move forward.

I also rename all io to catalog since it really just mean catalog and there is no point to introduce an abstract terminology IMO.

Development notes

Developer Certificate of Origin

We need all contributions to comply with the Developer Certificate of Origin (DCO). All commits must be signed off by including a Signed-off-by line in the commit message. See our wiki for guidance.

If your PR is blocked due to unsigned commits, then you must follow the instructions under "Rebase the branch" on the GitHub Checks page for your PR. This will retroactively add the sign-off to all unsigned commits and allow the DCO check to pass.

Checklist

[ ] Read the contributing guidelines
[ ] Signed off each commit with a Developer Certificate of Origin (DCO)
[ ] Opened this PR as a 'Draft Pull Request' if it is work-in-progress
[ ] Updated the documentation to reflect the code changes
[ ] Added a description of this change in the RELEASE.md file
[ ] Added tests to cover my changes
[ ] Checked if this change will affect Kedro-Viz, and if so, communicated that with the Viz team

kedro-org / kedro