Fix beta label on CCR index page

This commit fixes the location of the beta label on the CCR index page.

docs/reference/ccr/index.asciidoc

@@ -3,11 +3,11 @@
 [[xpack-ccr]]
 = Cross-cluster replication
 
-beta[]
-
 [partintro]
 --
 
+beta[]
+
 * <<ccr-overview, Overview>>
 * <<ccr-getting-started,Getting Started>>