Add clarification for 2.x section

Signed-off-by: Werner Lewis <werner.lewis@arm.com>
diff --git a/docs/3.0-migration-guide.md b/docs/3.0-migration-guide.md
index e728446..8474069 100644
--- a/docs/3.0-migration-guide.md
+++ b/docs/3.0-migration-guide.md
@@ -15,8 +15,10 @@
 - Changing function signatures, e.g. adding return codes, adding extra parameters, or making some arguments const.
 - Removal of functions, macros, and types previously marked as deprecated.
 
+Much of the information needed to determine a migration path can be found in the Mbed TLS 2.x documentation.
 
-## Referring to Mbed TLS 2.x documentation
+
+## Accessing the Mbed TLS 2.x documentation
 
 For features previously marked as deprecated, Mbed TLS 2.x documentation may
 explain how to upgrade, and should be referred to when migrating code. Where a