Docs for SERVER-35794: Read zone information for a collection during internal shardCollection command

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Original Description

Description:

No documentation summary in engineering ticket

Engineering Ticket Description:

The new internal shardCollection command that is run on the primary shard should read zone information from the config server if existent for the collection. It should use these zones to create the initial split points. If the shard key is not consistent with existing zone information, should throw an IllegalZone exception.

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Description

Scope of changes (files that need work and how much)

See scope from DOCS-11957 and DOCS-11988

Impact to other docs outside of this product

MVP (work and date?)

Resources (e.g. Scope Docs, Invision)