Fix yeelight service description placeholders

[epenet]

Proposed change

Fix incorrect implementation in #157957

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
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• Breaking change (fix/feature causing existing functionality to break)
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Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue: Move translatable URLs out of strings.json #154226 and Validate action translation placeholders #158225
• Link to documentation pull request:
• Link to developer documentation pull request:
• Link to frontend pull request:

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[home-assistant]

Hey there @zewelor, @shenxn, @starkillerOG, @alexyao2015, mind taking a look at this pull request as it has been labeled with an integration (yeelight) you are listed as a code owner for? Thanks!

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[Copilot]

Pull request overview

This PR fixes a bug in the Yeelight integration where the start_flow service was missing a required placeholder (examples_url) in its service registration, while the service description in strings.json referenced it.

Key Changes:

• Added the missing examples_url placeholder to the start_flow service registration in light.py
• This ensures consistency between the service description template in strings.json and the placeholders provided during service registration