sp_BlitzFirst.sql: Incorrect URL for Slow Data File Reads

[MMollart]

Version of the script
8.19

What is the current behavior?
In [sp_BlitzFirst], when a finding of "Server Performance - Slow Data File Reads" is reported, it provides a URL of https://www.brentozar.com/go/slow/ but this now redirects to 'Slow "Having" query try pre-filter'

If the current behavior is a bug, please provide the steps to reproduce.

What is the expected behavior?
Im not sure what the correct URL is - but should go to the right one! At a guess, i would presume it should redirect to: https://www.brentozar.com/blitz/slow-storage-reads-writes/

Which versions of SQL Server and which OS are affected by this issue? Did this work in previous versions of our procedures?
Azure SQL Managed Instance

[BrentOzar]

Thanks for the pull request! Looks good, merging into the dev branch. Will be in the next release with credit to you in the release notes.