Update docs README.md install command

[jonathan343]

Problem

When code generating a client, the docs/README.md file is currently generated with the following content:

Generating Documentation

Sphinx is used for documentation. You can generate HTML locally with the
following:

$ uv pip install ".[docs]"
$ cd docs
$ make html

However, when running uv pip install ".[docs]", the docs dependencies are not actually installed and the following warning is thrown:

warning: The package `aws-sdk-bedrock-runtime @ file:///Users/gytndd/dev/GitHub/aws-sdk-python/clients/aws-sdk-bedrock-runtime` does not have an extra named `docs`

This is a result of smithy-python#522 which moved the docs group from under [project.optional-dependencies] to [dependency-groups].

Solution

Update the install command to uv pip install --group docs .

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