Adding details about the fact that only SOME packages have been moved…

… to jakarta.

Adding details about the fact that only SOME packages have been moved to jakarta., and a link to the quite useful EESpecProfile class.

README.md

@@ -53,11 +53,12 @@ The migration tool is available as an Ant task, here is an example:
 
 ## Differences between Java EE 8 and Jakarta EE 9
 
-The differences between Java EE 8 and Jakarta EE 9 are limited to packages
+The differences between Java EE 8 and Jakarta EE 9 are limited to
+(some packages)[https://github.com/apache/tomcat-jakartaee-migration/blob/master/src/main/java/org/apache/tomcat/jakartaee/EESpecProfile.java]
 moving from the `javax.*` namespace to the `jakarta.*` namespace. Some packages
 have also been renamed. This migration tool performs all the package renaming
 necessary to migrate an application from Java EE 8 to Jakarta EE 9.
 
 Note: It will not be necessary to migrate any references to XML schemas. The
-schemas don't directly reference javax packages and Jakarta EE 9 will continue
+schemas don't directly reference `javax` packages and Jakarta EE 9 will continue
 to support the use of schemas from Java EE 8 and earlier.