Update tableau.md

[rpourzand]

Adding note about versions we just tested and referencing the cumulative metric w/ grain issue to remind people in Tableau docs as well

What are you changing in this pull request and why?

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

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[mirnawong1]

hey @rpourzand , thank you so much for opening this up! i slightly tweaked the wording. will go ahead and merge this for you but please let me know if you have strong opinions about the suggestion:

In any of our Semantic Layer interfaces (not only Tableau), you must include a time dimension when working with any cumulative metric that has a time window or granularity.