Remove documentation of entity_id camera action service template variable

[emontnemery]

Proposed change

Remove documentation of entity_id camera action service template variable

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.
• [x] 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: https://github.com/home-assistant/core/pull/128592
• 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.

Summary by CodeRabbit

• Documentation
  • Enhanced clarity in camera integration examples by using variable placeholders for entity_id.
  • Updated filename descriptions for record and snapshot actions to better reflect their purposes.
  • Improved examples to promote best practices in automation scripts.