Add description of Balanced net consumption entities for enphase_envoy

[catsmanac]

Proposed change

Add description of the Balanced net power consumption and lifetime balanced net energy consumption (grid import - grid export) for enphase_envoy. These have been added to enphase envoy as result of reports on data mismatches.

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/123154
• Link to parent pull request in the Brands repository:
• This PR fixes or closes issue: fixes https://github.com/home-assistant/core/issues/123071

Checklist

• [x] 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.
• [x] The documentation follows the Home Assistant documentation standards.

Summary by CodeRabbit

Summary by CodeRabbit

• Documentation
  • Clarified conditions under which specific sensors are disabled in the Enphase Envoy system.
  • Revised descriptions of multiphase installations with batteries for better understanding of grid interactions.
  • Enhanced explanations regarding sensor functionality and the implications of using different current transformers (CTs).