Change to Preparation Guide

Author: jzheaux

docs/modules/ROOT/nav.adoc

@@ -2,7 +2,7 @@
 * xref:prerequisites.adoc[Prerequisites]
 * xref:community.adoc[Community]
 * xref:whats-new.adoc[What's New]
-* xref:migration/index.adoc[Migrating for 6.0]
+* xref:migration/index.adoc[Preparing for 6.0]
 ** xref:migration/servlet/index.adoc[Servlet Migrations]
 *** xref:migration/servlet/session-management.adoc[Session Management]
 *** xref:migration/servlet/exploits.adoc[Exploit Protection]

docs/modules/ROOT/pages/migration/index.adoc

@@ -1,5 +1,5 @@
 [[migration]]
-= Migrating to 6.0
+= Preparing for 6.0
 
 The Spring Security team has prepared the 5.8 release to simplify upgrading to Spring Security 6.0.
 Use 5.8 and the steps below to minimize changes when