Delete unnecessary (and potentially misleading) comment in User Guide

(cherry picked from commit 1e50843)

documentation/src/docs/asciidoc/user-guide/writing-tests.adoc

@@ -2428,10 +2428,6 @@ lambda expression for a dynamic test, those fields will not be reset by callback
 or extensions between the execution of individual dynamic tests generated by the same
 `@TestFactory` method.
 
-As of JUnit Jupiter {jupiter-version}, dynamic tests must always be created by factory
-methods; however, this might be complemented by a registration facility in a later
-release.
-
 [[writing-tests-dynamic-tests-examples]]
 ==== Dynamic Test Examples