Spec: Update formatting in tables to use material content tabs (#14656)

* Spec: Udpate formatting to use material content tabs

* Collapse v1-v3 into a single tab

* Spec: Restore content dropped during tab formatting refactor

Restore four pieces of content that were accidentally removed in the
formatting-only tab refactor, as flagged by Steven's review:

- column_sizes: restore "Does not include bytes necessary to read other
  columns, like footers." sentence
- partitions: restore "(see below)" cross-reference to field_summary table
- partition-spec: restore note that writers use this field but readers use
  specs from manifest files
- properties: restore commit.retry.num-retries example

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* add back (see below)

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Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: Kevin Liu <kevinjqliu@users.noreply.github.com>

Author: 3 people