Change Chapter 12 Title to 'Synchronization' for Better Alignment with Content

[eleanorLYJ]

Since the primary focus of Chapter 12 is on the techniques used to synchronize access to shared resources in a multi-CPU environment, changing the title to 'Synchronization' would better reflect the content and improve clarity.

[jserv]

Since the primary focus of Chapter 12 is on the techniques used to synchronize access to shared resources in a multi-CPU environment, changing the title to 'Synchronization' would better reflect the content and improve clarity.

Agree. Please send pull requests.

[EricccTaiwan]

Since the primary focus of Chapter 12 is on the techniques used to synchronize access to shared resources in a multi-CPU environment, changing the title to 'Synchronization' would better reflect the content and improve clarity.

Agree. Please send pull requests.

Since #312 has been merged, this issue can be closed accordingly.

[jserv]

Close via #312