Review Table Method's Doc Comments

[jdunkerley]

This task is to review the doc comments on the Table.

enso_docs_design.txt

Verify the main description method and confirm the parameters. Check the examples work.

Restructured into the new format.

Build the document in the enso-org/design.

Leave Table.set to revisit.

[Cassandra-Clark]

• [ ] Table.filter
• [ ] Table.join

Remove imports Examples should be rethought, be self-contained