Add OpenEVSE button platform documentation

[firstof9]

Proposed change

This PR documents the new button entities added to the OpenEVSE integration:

• Restart EVSE: Restarts the charging module.
• Restart Wi-Fi: Restarts the Wi-Fi module.

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: Add OpenEVSE button platform core#172964
• 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.

[home-assistant]

It seems that this PR is targeted against an incorrect branch. Documentation updates which apply to our current stable release should target the current branch. Please change the target branch of this PR to current and rebase if needed. If this is documentation for a new feature, please add a link to that PR in your description.

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[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Documents newly available button entities for the OpenEVSE integration and declares the button platform in the integration metadata.

Changes:

• Added button to the integration’s declared ha_platforms.
• Added documentation for the “Restart EVSE” and “Restart WiFi” button entities.