remove broken link to external resource (#6229)

content/200-orm/200-prisma-client/100-queries/058-transactions.mdx

@@ -1150,10 +1150,9 @@ This section describes how to build your own optimistic concurrency control. See
 - ✔ You anticipate a high number of concurrent requests (multiple people booking cinema seats)
 - ✔ You anticipate that conflicts between those concurrent requests will be rare
 
-Avoiding locks in a application with a high number of concurrent requests makes the application more resilient to load and more scalable overall. Although locking is not inherently bad, locking in a high concurrency environment can lead to unintended consequences - even if you are locking individual rows, and only for a short amount of time. For more information, see:
+Avoiding locks in an application with a high number of concurrent requests makes the application more resilient to load and more scalable overall. Although locking is not inherently bad, locking in a high concurrency environment can lead to unintended consequences - even if you are locking individual rows, and only for a short amount of time. For more information, see:
 
 - [Why ROWLOCK Hints Can Make Queries Slower and Blocking Worse in SQL Server](https://littlekendra.com/2016/02/04/why-rowlock-hints-can-make-queries-slower-and-blocking-worse-in-sql-server/)
-- [The High Concurrency strategy](https://www.ibm.com/developerworks/library/j-ts5/index.html)
 
 #### Scenario: Reserving a seat at the cinema