Merge pull request kubernetes#1978 from zacharysarah/chair-emeritus

SIG Docs chair transition

Author: k8s-ci-robot

OWNERS_ALIASES

@@ -39,12 +39,12 @@ aliases:
     - mrbobbytables
     - nikhita
   sig-docs-leads:
+    - irvifa
     - jimangel
     - kbarnard10
     - kbhawkey
     - onlydole
     - sftim
-    - zacharysarah
   sig-instrumentation-leads:
     - brancz
     - dashpole