Updates the description of the vector parameters map in the update collection REST call. This changes our OpenAPI specification, but only modifies the description.

Here, users must provide a map of named vectors. Therefore, the current description is wrong. It was also confusing how to update parameters in a collection with a single unnamed vector.

This changes the description from:

Vector data parameters to update. It is possible to provide one config for single vector mode and list of configs for multiple vectors mode.

to:

Map of vector data parameters to update for each named vector. To update parameters in a collection having a single unnamed vector, use an empty string as name.

The description is presented here (vectors field): https://qdrant.github.io/qdrant/redoc/index.html#tag/collections/operation/update_collection

Requested in Discord: https://discord.com/channels/907569970500743200/1151909233793704068/1159432223049662496

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