Prepare for 4.18

Author: davsclaus

docs/user-manual/modules/ROOT/pages/camel-4x-upgrade-guide-4_18.adoc

@@ -0,0 +1,15 @@
+= Apache Camel 4.x Upgrade Guide
+
+This document is for helping you upgrade your Apache Camel application
+from Camel 4.x to 4.y. For example, if you are upgrading Camel 4.0 to 4.2, then you should follow the guides
+from both 4.0 to 4.1 and 4.1 to 4.2.
+
+[NOTE]
+====
+https://github.com/apache/camel-upgrade-recipes/[The Camel Upgrade Recipes project] provides automated assistance for some common migration tasks.
+Note that manual migration is still required.
+See the xref:camel-upgrade-recipes-tool.adoc[documentation] page for details.
+====
+
+== Upgrading Camel 4.17 to 4.18
+

docs/user-manual/modules/ROOT/pages/camel-4x-upgrade-guide.adoc

@@ -26,6 +26,7 @@ You can find the upgrade guide for each release in the following pages:
 - xref:camel-4x-upgrade-guide-4_15.adoc[Upgrade guide 4.14 -> 4.15]
 - xref:camel-4x-upgrade-guide-4_16.adoc[Upgrade guide 4.15 -> 4.16]
 - xref:camel-4x-upgrade-guide-4_17.adoc[Upgrade guide 4.16 -> 4.17]
+- xref:camel-4x-upgrade-guide-4_18.adoc[Upgrade guide 4.17 -> 4.18]
 
 [NOTE]
 ====