Update trigger.markdown

[finity69x2]

Add warnings to be considered when using the "for:" option.

Proposed change

The use of the "for:" option in automation triggers doesn't survive server restarts or automation reloading. This results in unexpected behavior if the user relies on the trigger to occur at the time specified. This is a big reliability concern when used and the user is unaware of this behavior.

If the underlying behavior can't be corrected then at a minimum there should be a warning in the documentation pointing out this limitation especially for time critical automation triggers.

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

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.