[JENKINS-43507] Add javadoc tag

src/main/java/jenkins/scm/api/trait/SCMTrait.java

@@ -92,6 +92,7 @@
     * Converts the supplied instance and list of {@link SCMTrait} instances into a list where there is at most one
     * instance of each trait.
     *
     * @param first an entry to prepend to the list (will displace any duplicates in the list)
     * @param list the list to apply the constraint to.
     * @param <T>  type of {@link SCMTrait}.
     * @return a new list that contains the first instance of any type of trait in the supplied list.