Added MSSQL domain auth example.

[engineertdog]

Creating this pull request to add an example to the MSSQL section for domain authentication. It took me a while to figure out how to do so in Sequelize when it was working in pure Tedious. The line in the docs, shown below, is what caused the confusion. Due to the statement, I had thought that all MSSQL specific configuration settings had to be in options under dialectOptions. Maybe the text can be changed, but I've added an example nonetheless.

Please note: tedious@^6.0.0 requires you to nest MSSQL specific options inside an additional options-object inside the dialectOptions-object.

[codecov]

Codecov Report

Merging #11799 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #11799   +/-   ##
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  Coverage   96.26%   96.26%           
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  Files          94       94           
  Lines        9191     9191           
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  Hits         8848     8848           
  Misses        343      343

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[papb]

Hello! I see you are a first-time contributor, thank you for taking the time to help Sequelize! I hope to see more PRs from you in the future! 😬

[papb]

I have rebased your PR manually since my recently-merged PR #11825 caused a conflict here.

[engineertdog]

Ah, no problem. There doesn't seem to be many people working with MSSQL, so it took me a while to figure out that the documentation wasn't exactly as clear as it could have been when it came to domain auth. The textual representation was a bid misleading in the docs. But, looks good!