net-mgmt/netbox: Update to 3.2.4

* Prune obsolete update instructions/notes for NetBox releases older
  than 2.9.

* Remove the DOCS option as the embedded documentation for NetBox now
  needs to be built locally because the necessary procedure requires a
  running instance of NetBox.

Changelog since 3.1.11:

It contains many bugfixes/enhancements and the following new features:

* Plugins Framework Extensions
* Modules & Module Types
* Custom Object Fields
* Custom Status Choices
* Improved User Preferences
* Inventory Item Roles
* Inventory Item Templates
* Service Templates
* Automatic Provisioning of Next Available VLANs

https://netbox.readthedocs.io/en/stable/release-notes/version-3.2/

MFH:		No (feature release)