Update members.md

Author: mchaisso

members.md

@@ -11,7 +11,7 @@ Version 8
 {% assign role_array = "pi|postdoc|gradstudent|researchstaff|visiting|others|alumni" | split: "|" %}
 <h1> Role array {{role_array}} </h1>
 {% for role in role_array %}
-{% assign people_in_role = people_sorted | where: 'position', role %}
+{% assign people_in_role = people_sorted | where: 'role', role %}
 <h2> People in role: {{people_in_role}} {{role}} </h2>
 {% if people_in_role.size == 0 %}
 <!-- Skip section if there's nobody -->