Update external links to SL instructions

[joaoclemencio-dbtlabs]

What are you changing in this pull request and why?

The current link to Lightdash's Semantic Layer instructions (https://docs.lightdash.com/guides/dbt-semantic-layer/) is not working. This seems to be the updated one: https://docs.lightdash.com/references/dbt-semantic-layer

Checklist

• I have reviewed the Content style guide so my content adheres to these guidelines.
• The topic I'm writing about is for specific dbt version(s) and I have versioned it according to the version a whole page and/or version a block of content guidelines.
• I have added checklist item(s) to this list for anything anything that needs to happen before this PR is merged, such as "needs technical review" or "change base branch."

[welcome]

Hello!👋 Thanks for contributing to the dbt product documentation and opening this pull request! ✨
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Name	Status	Preview	Updated (UTC)
docs-getdbt-com	✅ Ready (Inspect)	Visit Preview	Oct 15, 2024 8:36am

[mirnawong1]

hey @joaoclemencio-dbtlabs wow thank you so much for opening this up and catching this! great addition and will get this merged for you ✨!