Update calendar.markdown

[gonzotek]

Proposed change

Replace documentation for deprecated list_events with get_events per petro's suggestion in https://community.home-assistant.io/t/2023-12-welcome-home/651409/466

Type of change

• Spelling, grammar or other readability improvements (current branch).
• Adjusted missing or incorrect information in the current documentation (current branch).
• Added documentation for a new integration I'm adding to Home Assistant (next branch).
  • I've opened up a PR to add logo's and icons in Brands repository.
• Added documentation for a new feature I'm adding to Home Assistant (next branch).
• Removed stale or deprecated documentation.

Additional information

• Link to parent pull request in the codebase: n/a
• Link to parent pull request in the Brands repository: n/a
• This PR fixes or closes issue: fixes # n/a

Checklist

• This PR uses the correct branch, based on one of the following:
  • I made a change to the existing documentation and used the current branch.
  • I made a change that is related to an upcoming version of Home Assistant and used the next branch.
• The documentation follows the Home Assistant documentation standards.

[c0ffeeca7]

Thank you for the catch, @gonzotek!

However, I'm going to close this PR as a duplicate of #30196.
I was slow on implementing the review feedback there. That's the reason why this is still undocumented.

[gonzotek]

No worries, I opened the pr from the docs and missed checking for a dup.