Merge pull request #972 from etcd-io/release-v3.5-update-latest-release-to-v3.5.19

[v3.5] Update installation version to latest tag (v3.5.19)

Author: jmhbnz

content/en/docs/v3.5/_index.md

@@ -3,7 +3,7 @@ title: v3.5 docs
 cascade:
   version: v3.5
   versName: &name v3.5
-  git_version_tag: v3.5.18
+  git_version_tag: v3.5.19
   exclude_search: false
 linkTitle: *name
 simple_list: true