Included missing redirect from 12.5 convdev.md

doc/user/instance_statistics/convdev.md

+---
+redirect_to: '../instance_statistics/dev_ops_score.md'
+---
+
+This document was moved to [another location](../instance_statistics/dev_ops_score.md).

doc/user/instance_statistics/dev_ops_score.md

 # DevOps Score
 
+> [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/issues/30469) in GitLab 9.3.
 > [Renamed from Conversational Development Index](https://gitlab.com/gitlab-org/gitlab/issues/20976) in GitLab 12.6.
 
 NOTE: **Note:**