Fix Credo Readability (strict)

- Max line length, implicit try, alias order, zero-arity defs
- String sigils, long comments split; redundant blank lines fixed

lib/mv_web/plugs/check_page_permission.ex

@@ -221,7 +221,8 @@ defmodule MvWeb.Plugs.CheckPagePermission do
 
   defp path_param_equals(_, _, _, _), do: false
 
-  # For own_data: only allow show/edit when :id is the user's linked member. For other permission sets: allow when not reserved.
+  # For own_data: only allow show/edit when :id is the user's linked member.
+  # For other permission sets: allow when not reserved.
   defp members_show_allowed?(pattern, request_path, user) do
     if permission_set_name_from_user(user) == "own_data" do
       path_param_equals(pattern, request_path, "id", user_member_id(user))