Fix typo (fan_mode) in climate attribute docs

[tedpennings]

Proposed change

This PR fixes a typo in the climate docs for the attribute fan - it should be fan_mode.

Here's a community thread about it, https://community.home-assistant.io/t/tip-reading-an-attribute-from-a-climate-entity/509802/2 , and example traces from an automation below.

fan_mode example (correct, this PR)

fan example (incorrect, null, current docs)

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 logos 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:
• Link to parent pull request in the Brands repository:
• This PR fixes or closes issue: fixes #

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.

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