Update API documents for TPC settings

[kawakami-masaki0]

Pull Request Description:

• Update API document for get_target_platform_capabilities and get_target_platform_capabilities_sdsp.

• These files need to check

  • model_compression_toolkit/__init__.py
  • docs/api/api_docs/index.html
  • docs/api/api_docs/modules/target_platform_capabilities.html
  • docs/api/api_docs/methods/get_target_platform_capabilities.html
  • docs/api/api_docs/methods/get_target_platform_capabilities_sdsp.html

Checklist before requesting a review:

• I set the appropriate labels on the pull request.
• I have added/updated the release note draft (if necessary).
• I have updated the documentation to reflect my changes (if necessary).
• All function and files are well documented.
• All function and classes have type hints.
• There is a licenses in all file.
• The function and variable names are informative.
• I have checked for code duplications.
• I have added new unittest (if necessary).