Added documentation defining the state entry & exit sequence in the presence of orthogonal regions (various places).

[SVN r22791]

libs/statechart

@@ -1 +1 @@
-Subproject commit 778f2fdd0b32a2e7bfdbd6b05cfafc5e6c34a51a
+Subproject commit d1eaba8da53f5e016e48c67cb86f515d0ced2dc6