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doc: add headers command page (#1775)

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# headers
Use `headers` to turn the first row of a table into meaningful column names.
As demonstrated in the following example, it's particularly handy when working with spreadsheets.
## Examples
```shell
❯ open sample_data.ods | get SalesOrders
────┬────────────┬─────────┬──────────┬─────────┬─────────┬───────────┬───────────
# │ Column0 │ Column1 │ Column2 │ Column3 │ Column4 │ Column5 │ Column6
────┼────────────┼─────────┼──────────┼─────────┼─────────┼───────────┼───────────
0 │ OrderDate │ Region │ Rep │ Item │ Units │ Unit Cost │ Total
1 │ 2018-01-06 │ East │ Jones │ Pencil │ 95.0000 │ 1.9900 │ 189.0500
❯ open sample_data.ods | get SalesOrders | headers
────┬────────────┬─────────┬──────────┬─────────┬─────────┬───────────┬───────────
# │ OrderDate │ Region │ Rep │ Item │ Units │ Unit Cost │ Total
────┼────────────┼─────────┼──────────┼─────────┼─────────┼───────────┼───────────
0 │ 2018-01-06 │ East │ Jones │ Pencil │ 95.0000 │ 1.9900 │ 189.0500
1 │ 2018-01-23 │ Central │ Kivell │ Binder │ 50.0000 │ 19.9900 │ 999.4999
```