Merge pull request #49319 from katcosgrove/update-owners

Removes sftim from leads; adds katcosgrove

Author: k8s-ci-robot

OWNERS_ALIASES

@@ -158,10 +158,10 @@ aliases:
     - ysyukr
   sig-docs-leads: # Website chairs and tech leads
     - divya-mohan0209
+    - katcosgrove
     - natalisucks
     - reylejano
     - salaxander
-    - sftim
     - tengqm
   sig-docs-zh-owners: # Admins for Chinese content
     - chenrui333