Fix major version in 6.7 branch (#40507)

jasontedor · web-flow · commit 38402a7860f9 · 2019-03-27T05:21:50.000-04:00
This needs to remain at 6.x.
diff --git a/docs/Versions.asciidoc b/docs/Versions.asciidoc
@@ -1,5 +1,5 @@
 :version:               6.7.0
-:major-version:         6.7
+:major-version:         6.x
 :lucene_version:        7.7.0
 :lucene_version_path:   7_7_0
 :branch:                6.7
