fix docs branch version

jimczi · jimczi · commit db008eecd9ad · 2018-05-04T15:41:31.000+02:00
diff --git a/docs/Versions.asciidoc b/docs/Versions.asciidoc
@@ -2,7 +2,7 @@
 :major-version:         6.x
 :lucene_version:        7.4.0
 :lucene_version_path:   7_4_0
-:branch:                6.
+:branch:                6.x
 :jdk:                   1.8.0_131
 :jdk_major:             8
 
