Man pages matching name dbix::class::tree::nestedset in section 3pm:

DBIx::Class::Tree::NestedSet.3pm.en	debian 10 / libdbix-class-tree-nestedset-perl
DBIx::Class::Tree::NestedSet.3pm.en	debian 11 / libdbix-class-tree-nestedset-perl
DBIx::Class::Tree::NestedSet.3pm.en	debian 12 / libdbix-class-tree-nestedset-perl