Updating partitioning docs to reflect BBM changes
What does this MR do and why?
With #379126 (closed) and !116601 (merged) (yet to be merged) made changes to use batched background migrations (instead of legacy background migrations) in table partitioning helpers, this issue reflects those changes in the docs.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #365354 (closed)
Edited by Prabakaran Murugesan