Update current version for 7.10

conf.yaml

@@ -54,7 +54,7 @@ contents:
         sections:
           - title:      Installation and Upgrade Guide
             prefix:     en/elastic-stack
-            current:    &stackcurrent 7.9
+            current:    &stackcurrent 7.10
             index:      docs/en/install-upgrade/index.asciidoc
             branches:   [ master, 7.x, 7.10, 7.9, 7.8, 7.7, 7.6, 7.5, 7.4, 7.3, 7.2, 7.1, 7.0, 6.8, 6.7, 6.6, 6.5, 6.4, 6.3, 6.2, 6.1, 6.0, 5.6, 5.5, 5.4, 5.3, 5.2, 5.1, 5.0 ]
             live:       &stacklive [ master, 7.x, 7.10, 7.9, 6.8 ]

shared/versions/stack/7.10.asciidoc

@@ -18,7 +18,7 @@ bare_version never includes -alpha or -beta
 release-state can be: released | prerelease | unreleased
 //////////
 
-:release-state:          unreleased
+:release-state:          released
 
 ////
 APM Agent versions

shared/versions/stack/current.asciidoc

@@ -1 +1 @@
-include::7.9.asciidoc[]
+include::7.10.asciidoc[]