1997669 - Update browsertime config references in doc

Status: NEW

(Testing :: Performance, task, P2)

Description

[Kash Shampur [:kshampur] ⌚EST]

I missed one reference that needed to be updated from bug 1989652 when browsertime config (among others) were moved to their own kind.

e.g. in this rst file: https://searchfox.org/firefox-main/rev/50445a0ee5bbeaeba68911b649963669e4c483e2/testing/raptor/raptor/perfdocs/browsertime.rst#291

the link;
https://searchfox.org/firefox-main/rev/8dd8dd96de313fb8e069ef6fd16600a6aa9e5c27/taskcluster/ci/test/browsertime-desktop.yml#404-406

should be changed to something like:
https://searchfox.org/firefox-main/rev/50445a0ee5bbeaeba68911b649963669e4c483e2/taskcluster/kinds/browsertime/desktop.yml#620-622