Update flow.serve and flow.deploy docstrings and docs for multiple schedules

[discdiver]

Docstring params for flow.deploy and flow.serve now reference multiple parameters.
Removes redundant section in schedules doc and updates the docstring language on that page.

Example

Checklist

• This pull request references any related issue by including "closes <link to issue>"
  • If no issue exists and your change is not a small fix, please create an issue first.
• This pull request includes tests or only affects documentation.
• This pull request includes a label categorizing the change e.g. maintenance, fix, feature, enhancement, docs.

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• This pull request includes redirect settings in netlify.toml for files that are removed or renamed.

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• This pull request includes helpful docstrings.
• If a new Python file was added, this pull request contains a stub page in the Python SDK docs and an entry in mkdocs.yml navigation.

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[billpalombi]

lgtm

[bunchesofdonald]

❤️ Thank you!