[en] Fix missing anchor to SIG list

Author: bconfiden2

content/en/docs/reference/glossary/sig.md

@@ -2,7 +2,7 @@
 title: SIG (special interest group)
 id: sig
 date: 2018-04-12
-full_link: https://github.com/kubernetes/community/blob/master/sig-list.md#master-sig-list
+full_link: https://github.com/kubernetes/community/blob/master/sig-list.md#special-interest-groups 
 short_description: >
   Community members who collectively manage an ongoing piece or aspect of the larger Kubernetes open source project.