strip old coming 6.4.3 tag (#36507)

bmorelli25 · web-flow · commit 7d1cf238d7ca · 2018-12-11T13:23:56.000-08:00
diff --git a/docs/reference/release-notes/6.4.asciidoc b/docs/reference/release-notes/6.4.asciidoc
@@ -37,8 +37,6 @@
 [[release-notes-6.4.3]]
 == {es} version 6.4.3
 
-coming[6.4.3]
-
 Also see <<breaking-changes-6.4>>.
 
 [float]
