Update HomeWizard Battery group mode entity information

[DCSBL]

Clarified the location of the Battery group mode select entity and its availability based on device type.

Proposed change

Made the explanation where to find the mode a bit more clear and how users may have to enable the entity.

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: Enable HomeWizard Battery group mode by default when device controls batteries core#159493
• 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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[Copilot]

Pull request overview

This pull request clarifies where users can find the Battery group mode select entity for HomeWizard Plug-In Batteries, addressing potential confusion about its location and availability.

Key changes:

• Updated explanation to specify that the entity is located on either the P1 Meter or kWh Meter device (whichever manages the batteries), not on the battery device itself
• Added context about when the entity may be disabled by default (when batteries are added after initial setup)