setup: Update docs/ops/memory/mem_setup.md

Co-Authored-By: Till Rohrmann <till.rohrmann@gmail.com>

docs/ops/memory/mem_setup.md

@@ -130,7 +130,7 @@ see also [JVM parameters](#jvm-parameters).
 a bigger JVM limit in this case.
 
 <strong>Note:</strong> The *network memory* is also part of JVM *direct memory* but it is managed by Flink and guaranteed
-that it is always allocated within its configured size. Therefore, resizing network memory will not necessarily help in this situation.
+that it is always allocated within its configured size. Therefore, resizing the *network memory* will not help in this situation.
 
 See also [detailed Memory Model](#detailed-memory-model).