add: links to related types for fluent builders (#1022)

* add: links to related types for fluent builders

* update: CHANGELOG.next.toml

* update: generate fancy documented lists

* refactor: put docs on client builder methods instead of fluent builder
rename: generateShapeMemberList -> generateShapeMemberDocs
refactor: move generateShapeMemberList to FluentClientDecorator.kt
update: appease spellchecker

* remove: extra line in docs

* remove: unnecessary snake case conversion