docs(tools): the sampling tools are not in the `auto` group since v2.0 `SpiceToolsOptions::Auto` stopped including `sample_distinct_columns`, `random_sample`, and `top_n_sample` in v2.0.0 — they are only provided by `all`, `search_registry`, and `nsql`, or by naming them individually. Also adds the two `auto` tools the table never listed (`get_readiness`, `get_current_datetime`) and the `nsql` / `disabled` tool-group values.

Add versioned docs for v2.1 (#1903) Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Add versioned docs for v2.1 (#1903) Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>