Merge branch 'patch-28' into 'master'

add link to concurrent devops

See merge request gitlab-org/gitlab-ce!22071

doc/user/instance_statistics/convdev.md

@@ -2,20 +2,21 @@
 
 > [Introduced][ce-30469] in GitLab 9.3.
 
-Conversational Development Index (ConvDev) gives you an overview of your entire
-instance's feature usage, from idea to production. It looks at your usage in the
-past 30 days, averaged over the number of active users in that time period. It also
-provides a lead score per feature, which is calculated based on GitLab's analysis
-of top performing instances, based on [usage ping data][ping] that GitLab has
+The Conversational Development Index (ConvDev Index) gives you an overview of your entire
+instance's adoption of [Concurrent DevOps](https://about.gitlab.com/concurrent-devops/)
+from planning to monitoring. It displays the usage of these GitLab features over
+the last 30 days, averaged over the number of active users in that time period. It also
+provides a Lead score per feature, which is calculated based on GitLab's analysis
+of top-performing instances based on [usage ping data][ping] that GitLab has
 collected. Your score is compared to the lead score, expressed as a percentage.
-The overall index score is an average over all your feature scores.
+Your overall index score is an average of all your feature score percentages.
 
 ![ConvDev index](img/convdev_index.png)
 
 The page also provides helpful links to articles and GitLab docs, to help you
 improve your scores.
 
-Your GitLab instance's usage ping must be activated in order to use this feature.
+Your GitLab instance's [usage ping][ping] must be activated in order to use this feature.
 Usage ping data is aggregated on GitLab's servers for analysis. Your usage
 information is **not sent** to any other GitLab instances.