WIP: docs changes for v2.4

[marshall007]

• [x] I have read and agreed to the RethinkDB Contributor License Agreement http://rethinkdb.com/community/cla/

Description

Fixes #1178.

• [ ] docs for set_write_hook
  • [x] JS
  • [ ] Python
  • [ ] Ruby
• [ ] docs for get_write_hook
  • [x] JS
  • [ ] Python
  • [ ] Ruby
• [x] update table_config docs to include new write_hook field

[srh]

Note we've also got a Java driver. It will also need actual write hook support, see https://github.com/rethinkdb/rethinkdb/issues/6545.

[FilipeRamalho]

Why is development stopped on this pull request ?

[srh]

@FilipeRamalho Please finish the documentation for Python and Ruby.

[thelinuxlich]

I think the PR should cover the insert/update/delete/replace optarg ignoreWriteHook

[srh]

Finished in PR #1241. Includes all of the checklist items and also the ignoreWriteHook optarg.