Update MultiTaskGP Docstring

[jduerholt]

Motivation

This PR fixes a wrong docstring regarding the noise prior of the multitask gp.

Have you read the Contributing Guidelines on pull requests?

Yes.

Test Plan

Only docs.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.98%. Comparing base (f84cf18) to head (4c5c0d8).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3307   +/-   ##
=======================================
  Coverage   99.98%   99.98%           
=======================================
  Files         226      226           
  Lines       22470    22470           
=======================================
  Hits        22466    22466           
  Misses          4        4           

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[saitcakmak]

Thanks!

[meta-codesync]

@saitcakmak has imported this pull request. If you are a Meta employee, you can view this in D105971096.

[meta-codesync]

@saitcakmak merged this pull request in e533cd3.