Update sig-docs/annual-report-2021.md

Add content to the challenges section

Co-authored-by: Tim Bannister <[email protected]>

Author: divya-mohan0209

sig-docs/annual-report-2021.md

@@ -35,7 +35,9 @@ In future, this will be generated from kubernetes/enhancements kep.yaml files
 
    - Require more contributors to form a stable pool for the blog subproject, in particular and SIG Docs, generally.
    - Require guidelines on how we could ramp up folks nominated to the New Contributor Ambassador role specific to SIG Docs. 
-
+    - One localization (Ukrainian) is primarily worked on by people based in Ukraine,
+      where the ongoing and intensifying conflict creates challenges that take priority over
+      open source contribution.
 2. What metrics/community health stats does your group care about and/or measure?