TINYDOC-3531 - Document expand and split format parameters for content formatting

[kemister85]

Ticket: TINYDOC-3531

Site: Staging branch

Changes:

• Documented the expand format parameter in modules/ROOT/partials/configuration/formats.adoc (Format parameters section): description, type, default (true for selector formats), possible values, and an example. expand controls whether the range is expanded to cover the whole matching selector element before a format is applied or removed; expand: false restricts the operation to the current selection.
• Documented the split format parameter: description, type, default (true for inline/non-selector formats, false for selector/block formats), possible values, and an example. split controls whether the wrapping element is split at the selection boundaries when a format is removed.
• Both parameters were already used in the existing block_expand, deep, and removeformat examples on this page but were undefined; they are now listed alongside the other format object properties.
• Fixed a pre-existing malformed AsciiDoc marker in the adjacent block_expand entry (+Default value:* -> *Default value:*) so its default value renders in bold like every other parameter.

All parameter descriptions and defaults were validated against the TinyMCE core formatter source.

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Pre-checks:

• Branch is correctly prefixed: hotfix/8/TINYDOC-3531

• Files have been included where required (partial included by content-formatting.adoc).

• Build passes without console errors, warnings, or issues.

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Review:

• Documentation Team Lead has reviewed.