Remove the term worker from the Plan and operate a fleet of instance or group runners doc

Darren Eastmanrequested to merge
DarrenEastman-main-patch-8048 into main

What does this MR do?

Remove the term worker as this is no longer used in the runner glossary

Why was this MR needed?

We are ensuring consistency in the terminology used in the runner documentation.

Edited by Darren Eastman

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