Add missing endif (#4377)

(cherry picked from commit 39b4158)

Author: maximiliankolb

guides/doc-Tuning_Performance/master.adoc

@@ -79,6 +79,7 @@ include::common/modules/con_smart-proxy-configuration-tuning.adoc[leveloffset=+2
 include::common/modules/con_smartproxy-performance-tests.adoc[leveloffset=+3]
 endif::[]
 endif::[]
+endif::[]
 
 ifndef::orcharhino,satellite[]
 include::common/ribbons.adoc[]