Update index_advisor.mdx

[tylerfontaine]

Fix universal dashboard link to query-performance

I have read the CONTRIBUTING.md file.

YES

What kind of change does this PR introduce?

docs update, ...

What is the current behavior?

The link to the dashboard has a * instead of a _ to allow uses to choose their project, which results in a 404.

What is the new behavior?

It properly lets users select their own project.

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[tylerfontaine]

@alaister @charislam Not sure what else might be needed here? I see Alaister added the prettier ignore, but it didn't seem to work.

Also, had no idea underscores would need to be escaped. Thanks for the catch!

[charislam]

Pushed a fix! Should work now 🤞🏼