Remove defunct write partitioning property

[blvckcoffee]

Description

• Removes preferred-write-partitioning-min-number-of-partitions from properties reference.
• Removes reference to defunct property in description of use-preferred-write-partitioning.

Additional context and related issues

• This commit removed the property in Trino 416 release: f6a8eb2

Release notes

(x) This is not user-visible or docs only and no release notes are required.
( ) Release notes are required, please propose a release note for me.
( ) Release notes are required, with the following suggested text:

# Section
* Fix some things. ({issue}`issuenumber`)

[mosabua]

The removal is fine. The description from the old docs is not ideal. Maybe we can do a follow up. Lets chat separately about that.