docs: Add scale-writers property documentation

[garimauttam]

Description

Adds documentation for the scale-writers configuration property that was missing from the documentation.

Related Issue

Resolves #26303

Changes

• Added scale_writers session property documentation in properties-session.rst
• Added scale-writers configuration property documentation in properties.rst
• Includes type, default value, and description

Testing

• Built documentation successfully with ./build
• No new errors or warnings
• Verified formatting matches existing properties

== NO RELEASE NOTE ==

Summary by Sourcery

Document the scale-writers property in both session and configuration admin docs.

Documentation:

• Add documentation for the scale_writers session property to the session properties reference.
• Add documentation for the scale-writers configuration property, including type, default, and description, to the admin properties reference.

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Hey - I've reviewed your changes and they look great!

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[steveburnett]

LGTM! (docs)

Pull branch, local doc build, looks good. Thanks!

[hantangwangd]

Thanks for this documentation supplement. Overall looks good to me, just a couple of minor comments left.

[hantangwangd]

Thanks @garimauttam, lgtm!

[steveburnett]

Thanks for the update! Just two nits of formatting.

[steveburnett]

Three formatting nits in the cross-reference links, but everything else looks good. Thanks!

[steveburnett]

LGTM! (docs)

Pull updated branch, new local doc build, looks good. Thanks!

[hantangwangd]

Thanks @garimauttam, lgtm!