Add description for get_lineage Too

[Muizzkolapo]

What are you changing in this pull request and why?

This pr adds descriptions for a new mcp tools, get_lineage. The change is related to dbt-labs/dbt-mcp#461

To learn more about the writing conventions used in the dbt Labs docs, see the Content style guide.
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Checklist

• The changes in this PR meet the docs style guide/fundamentals required for all content.
• Applied the proper versioning rules if the content is for specific dbt version(s): (version a whole page or version a block of content
• The content in this PR requires a dbt release note, so I added one to the release notes page.).

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