docs: Update domain Public API documentation

lib/mv_web/controllers/page_controller.ex

@@ -1,4 +1,10 @@
 defmodule MvWeb.PageController do
+  @moduledoc """
+  Controller for rendering the homepage.
+
+  This controller handles the root route and renders the application's
+  homepage view.
+  """
   use MvWeb, :controller
 
   def home(conn, _params) do

lib/mv_web/live/member_live/form.ex

@@ -13,7 +13,7 @@ defmodule MvWeb.MemberLive.Form do
   ## Form Sections
   - Personal Data: Name, address, contact information, membership dates, notes
   - Custom Fields: Dynamic fields in uniform grid layout (displayed sorted by name)
-  - Payment Data: Mockup section (not editable)
+  - Membership Fee: Selection of membership fee type with interval validation
 
   ## Events
   - `validate` - Real-time form validation