Update backfills docs with more up to date info on single runs #23724
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Summary & Motivation
I noticed the docs of the backfill page for single runs are out of date with 1.8 based on the changes here: #21259
Starting this PR to correct that - the note on the backfill was incorrent in its current form.
It seems if you do try and run a job with multiple different backfill polices it will default to the policy with least max_partitions_per_run, failing that it will default to using multi_run(max_partitions_per_run=1)