GH-50622: [Docs][Format] Align Variant typed_value primitive type mappings with the Parquet shredding spec - #50810
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Rationale for this change
The existing Arrow spec is misleading and allows certain Arrow types to be typed value Variant fields. The Parquet Shredding spec specifically rejects them - Unsigned integers, Null.
Decimal mapping needs clarification about precision.
What changes are included in this PR?
Change the Primitive Type Mappings table for Parquet Variant extension type.
Rendered version - https://github.com/sdf-jkl/arrow/blob/gh50622-variant-typed-value-mappings/docs/source/format/CanonicalExtensions.rst#primitive-type-mappings
Are these changes tested?
N/A
Are there any user-facing changes?
Changes to the Arrow docs
Closes #50622
typed_valueprimitive type mappings with the Parquet shredding spec #50622