Fixed #28349 -- Doc'd how to upgrade Django from LTS to LTS.

docs/howto/upgrade-version.txt

@@ -33,6 +33,14 @@ the new Django version(s):
 Pay particular attention to backwards incompatible changes to get a clear idea
 of what will be needed for a successful upgrade.
 
+If you're upgrading through more than one feature version (e.g. A.B to A.B+2),
+it's usually easier to upgrade through each feature release incrementally
+(A.B to A.B+1 to A.B+2) rather than to make all the changes for each feature
+release at once. For each feature release, use the latest patch release (A.B.C).
+
+The same incremental upgrade approach is recommended when upgrading from one
+LTS to the next.
+
 Dependencies
 ============