autopurge is not documented

[ogjz591p]

Autopurge is not being documented in apt-get(8)
Since the parameter simplify removing automatically installed dependencies and more intuitive than autoremove --purge adding this feature to the documentation would make the feature more discoverable as well

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: apt 2.4.8
ProcVersionSignature: Ubuntu 5.15.0-58.64-generic 5.15.74
Uname: Linux 5.15.0-58-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu82.3
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: KDE
Date: Sun Jan 22 04:41:37 2023
InstallationDate: Installed on 2022-12-11 (41 days ago)
InstallationMedia: Kubuntu 22.04.1 LTS "Jammy Jellyfish" - Release amd64 (20220809.1)
SourcePackage: apt
UpgradeStatus: No upgrade log present (probably fresh install)