Change "Company" to "Affiliation" in ESC members list

Change-Id: I43e292f4c09c677f2ba2a6be61c22f5529770731
diff --git a/pages/site/members.md b/pages/site/members.md
index 56ff428..ee93a2d 100644
--- a/pages/site/members.md
+++ b/pages/site/members.md
@@ -10,7 +10,7 @@
 
 Members of the Engineering Steering Committee (ESC) for the 2019 term are:
 
-| Name                  | Company                |
+| Name                  | Affiliation            |
 |-----------------------|------------------------|
 | Alice Kober-Sotzek    | Google                 |
 | Ben Rohlfs            | Google                 |