Use fully-qualified class names for non-Spring types

Date-and-Time-Formatting-with-JDK-20-and-higher.md

@@ -42,7 +42,7 @@ TODO
 
 #### Lenient `SimpleDateFormat` and `DateTimeFormatter` Configuration
 
-In JDK 23, the Java team introduced support for lenient parsing of space characters in `SimpleDateFormat` as well as `DateTimeFormatter`.
+In JDK 23, the Java team introduced support for lenient parsing of space characters in `java.text.SimpleDateFormat` as well as `java.time.format.DateTimeFormatter`.
 
 `SimpleDateFormat` is lenient by default; however, `DateTimeFormatter` instances are not lenient by default, and factory methods like `DateTimeFormatter.ofLocalizedTime(...)` do not create lenient formatters.