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What changes were proposed in this pull request?

HDDS-13575. Update Erasure Coding section in the Topology Awareness user doc

Please describe your PR in detail:

  • Add EC section in the topology awareness user doc
  • Generated-by: Google Gemini 2.5 Pro + Gemini Cli

What is the link to the Apache JIRA

https://issues.apache.org/jira/browse/HDDS-13575

How was this patch tested?

…ser doc.

Change-Id: I66c09d82a3eb89edff3538c59fd53e131065cab8
This commit adds a new section to the topology documentation to explain the Erasure Coded container placement policy (`SCMContainerPlacementRackScatter`).

The new section includes:
- The default policy for EC containers.
- How the policy works to scatter blocks across racks.
- The configuration key to customize the policy.
- The limitations of the policy.

This commit also corrects the reference numbers in the document.

Change-Id: Iab13978463b6266fb9395754954ba5c12e878f3e
@jojochuang jojochuang added documentation Improvements or additions to documentation AI-gen labels Aug 14, 2025
@sodonnel
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This is probably going to conflct with #8947 so maybe we should complete it and then review / rebase this one?

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