FSMCFRFF — In Figure 7.23 and Figure 7.25, sequence diagrams don't contain alternative combination fragment

In Figure 7.23 and Figure 7.25, sequence diagrams should show phases of communication between ports such as 'connect' with alternative combination fragments.

Add alternative sections to sequence diagrams in Figure 7.23 and 7.25

To show each phase such as connection clearer, alternative sections has been added to sequence diagram in Figure 7.23 and Figure 7.25.