[1.8 backport] Add example for dependency with multiple extras #9215
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Backport #9138 to 1.8
The currently existing example on how to install dependency extras only shows a single dependency:
fastapi = {version="^0.92.0", extras=["all"]}
Since right before this example it is shown how to install multiple extras using the command line interface, this can be confusing and lead to hard to understand missing dependencies:
poetry install --extras "mysql pgsql"
Note that the CLI has quotes around both extras and no commas, while in pyproject.toml each extra must be quoted and comma-separated, which is currently not documented.
Thus the change adds an example with more than one extra, based on pandas.
Pull Request Check List
Resolves: -
Not applicable, pure documentation change.