[DOCS] Uncomments Logstash breaking changes

Author: lcawl

docs/en/install-upgrade/breaking.asciidoc

@@ -126,5 +126,5 @@ This list summarizes the most important breaking changes in {ls} {version}. For
 the complete list, go to
 {logstash-ref}/breaking-changes.html[Logstash breaking changes].
 
-//include::{ls-repo-dir}/static/breaking-changes.asciidoc[tag=notable-breaking-changes]
+include::{ls-repo-dir}/static/breaking-changes.asciidoc[tag=notable-breaking-changes]