Fix autoscale documentation typos

Bob Singhrequested to merge
bobsingh.dev/gitlab-runner-deletion_scheduled-77678126:fix/docs-autoscale-typos into main

What does this MR do?

Fixes minor documentation typos in the autoscale configuration documentation.

Why was this MR needed?

These fixes correct grammar and typographical errors to improve documentation clarity.

What's the best way to test this MR?

Documentation change only. No functional impact.

What are the relevant issue numbers?

None.

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