Optimize the remaining documentation

Appendix.md

@@ -635,9 +635,10 @@ https://github.com/advancedmysql/mysql_8.0.27/blob/main/semisynchronous.txt
 **Patch for "Percona Server for MySQL 8.0.27-18":**
 
 Patch Address:
+
 https://github.com/advancedmysql/mysql_8.0.27/blob/main/book_8.0.27_single.patch
 
-This patch specifically targets optimizations for standalone MySQL instances, including:
+This patch specifically targets optimizations for a standalone MySQL instance, including:
 
 - **MVCC ReadView** enhancements
 - **Binlog group commit** improvements
@@ -653,4 +654,4 @@ For MySQL clusters, the patch introduces further optimizations for **Group Repli
 
 In earlier years, Bin Wang worked at an internet company focused on developing high-performance computing and high-concurrency systems. He also contributed to open-source projects like TCPCopy [60] and MySQL Proxy [61], gaining valuable experience in problem-solving, particularly in logical thinking.
 
-After leaving the internet company, he concentrated on MySQL-related development, successfully contributing to projects such as Group Replication, secondary replay, InnoDB storage engines, and query optimization. He has accumulated extensive experience in problem-solving within the MySQL domain.
+After leaving the internet company, he concentrated on MySQL-related development, successfully contributing to projects such as Group Replication, secondary replay, InnoDB storage engines, and query optimization [64]. He has accumulated extensive experience in problem-solving within the MySQL domain.

Chapter9.md

@@ -771,7 +771,7 @@ In a single-primary group, in the event of a primary failover when a secondary i
 
 Consistency during failover includes:
 
-- **RW Transactions**: Wait for all preceding transactions to complete before being applied, ensuring synchronization only affects RO transactions.
+- **RW Transactions**: Wait for all preceding transactions to complete before being applied.
 - **RO Transactions**: Wait for preceding transactions to complete before execution, ensuring they read the latest data.
 
 New transactions on a newly elected primary are held until the backlog is applied, guaranteeing that clients see the latest values. This approach prioritizes consistency but may introduce delays depending on the backlog size.

References.md

@@ -126,4 +126,6 @@
 
 [63] Jelena Antic, Georgios Chatzopoulos, Rachid Guerraoui, and Vasileios Trigonakis. 2016. Locking made easy. In Proceedings of the International Middleware Conference (Middleware). 1--14.
 
+[64] https://github.com/advancedmysql/mysqlplus.
+
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