SNOW-1359115 Add info about numbers in arrow batches to docs

[sfc-gh-pfus]

Description

SNOW-XXX Please explain the changes you made here.

Checklist

• [ ] Created tests which fail without the change (if possible)
• [ ] Extended the README / documentation, if necessary

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 75.44%. Comparing base (15db231) to head (83127cd).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1151 +/- ## ======================================= Coverage 75.44% 75.44% ======================================= Files 53 53 Lines 11291 11291 ======================================= Hits 8519 8519 Misses 2772 2772 ```

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