Added spaces (#494)

Co-authored-by: Johan Kragt <[email protected]>

Author: JohannisK

src/main/java/org/openrewrite/staticanalysis/AnnotateNullableMethods.java

@@ -51,8 +51,8 @@ public String getDisplayName() {
     @Override
     public String getDescription() {
         return "Add `@Nullable` to non-private methods that may return `null`. " +
-                "By default `org.jspecify.annotations.Nullable` is used, but through the `nullableAnnotationClass` option a custom annotation can be provided." +
-                "When providing a custom `nullableAnnotationClass` that annotation should be meta annotated with `@Target(TYPE_USE)`." +
+                "By default `org.jspecify.annotations.Nullable` is used, but through the `nullableAnnotationClass` option a custom annotation can be provided. " +
+                "When providing a custom `nullableAnnotationClass` that annotation should be meta annotated with `@Target(TYPE_USE)`. " +
                 "This recipe scans for methods that do not already have a `@Nullable` annotation and checks their return " +
                 "statements for potential null values. It also identifies known methods from standard libraries that may " +
                 "return null, such as methods from `Map`, `Queue`, `Deque`, `NavigableSet`, and `Spliterator`. " +