Minor fixes to inverter control + doc updates

What's Changed

Bug fixes to inverter control

• Immediate charge control had the wrong SOC target during charge/discharge freeze (probably unused right now)
• Hold charge as enabled when at 100% - #1623
• In calibration mode ensure all inverters are reset to the default (not just the first one)

#1627

Documentation updates

Added freeze charge/discharge service to apps.yaml section
Updated the example energy rate chart to include 24 hours back

• Update apps-yaml.md by @springfall2008 in #1628
• Update example_chart.yml & apps-yaml.md by @springfall2008 in #1629

Full Changelog: v8.6.0...v8.6.1