docs: Remove references to --include-related

[msardana94]

I believe --include-related is deprecated in 2.0.0 as mentioned in #5957. I am currently on 2.5.0 version

$ meltano --no-environment install --help
2023-04-18T05:33:22.577125Z [info     ] No environment is active
Usage: meltano install [OPTIONS] [[extractor|loader|transform|orchestrator|tra
                       nsformer|file|utility|mapper|mapping|extractors|loaders
                       |transforms|orchestrators|transformers|files|utilities|
                       mappers|mappings]] [PLUGIN_NAME]...

      Install all the dependencies of your project based on the meltano.yml
      file.

      Read more at https://docs.meltano.com/reference/command-line-interface#install
          

Options:
  --clean                    Completely reinstall a plugin rather than simply
                             upgrading if necessary.
  -p, --parallelism INTEGER  Limit the number of plugins to install in
                             parallel. Defaults to the number of cores.
  --database-uri TEXT        System database URI.
  --help                     Show this message and exit.

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[WillDaSilva]

Thanks @msardana94!