fix!: adjust brushes opacities

[Xiaoy312]

GitHub Issue: closes #1236

PR Type

What kind of change does this PR introduce?

• Bugfix

Description

-DisabledLow opacity and -DisabledLowBrushes have been removed. Use -Disable and -DisableBrush as their replacement.

PR Checklist

Please check if your PR fulfills the following requirements:

• Commits must be following the Conventional Commits specification
• [x] Tested the changes where applicable:
  • [ ] UWP
  • [ ] iOS
  • [ ] Android
  • [ ] WASM
  • [ ] MacOS
• [x] Updated the documentation as needed:
  • [x] General Doc Update
  • [ ] material-controls-styles.md
  • [ ] cupertino-controls-styles.md
  • [ ] lightweight-styling.md (LightWeight Styling Resource Keys)
• [ ] Contains No breaking changes

  If the pull request contains breaking changes, commit message must contain a detailed description of the action to take for the consumer of this library. As explained by the Conventional Commits specification