Update pip install instructions in semantic-layer-2-setup.md

[tromsky]

Adding double-quotes around the module name and extra information in installation command to help guarantee success

What are you changing in this pull request and why?

In the installation instructions for Metricflow here, the instructions state:

source [virtual environment name]/bin/activate
# install dbt and MetricFlow
pip install dbt-metricflow[adapter name]
# e.g. dbt-metricflow[snowflake]

However, thesyntax for pip installation instructions with optional extras should wrap the module and extras in double quotes:

pip install "dbt-metricflow[adapter name]"

This is guaranteed to run successfully, while the version without quotes may not.

This also follows the convention in the Metricflow tutorial README.md here

Checklist

• Review the Content style guide and About versioning so my content adheres to these guidelines.
• Add a checklist item for anything that needs to happen before this PR is merged, such as "needs technical review" or "change base branch."

Adding new pages (delete if not applicable):

• Add page to website/sidebars.js
• Provide a unique filename for the new page

Removing or renaming existing pages (delete if not applicable):

• Remove page from website/sidebars.js
• Add an entry website/static/_redirects
• Ran link testing to update the links that point to the deleted page

[welcome]

Hello!👋 Thanks for contributing to the dbt product documentation and opening this pull request! ✨
We use Markdown and some HTML to write the dbt product documentation. When writing content, you can use our style guide and content types to understand our writing standards and how we organize information in the dbt product docs.
We'll review your contribution and respond as soon as we can. 😄

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[mirnawong1]

hey @tromsky thanks for opening this pr up and spot on! it also aligns with the dedicated metricflow cli doc here - appreciate you opening this up to fix this!