[JENKINS-43507] Documenting SCMNavigatorTrait and SCMNavigatorTraitDe…

…scriptor

src/main/java/org/jenkinsci/plugins/github_branch_source/BranchDiscoveryTrait.java

@@ -111,7 +111,7 @@ public String getDisplayName() {
        }

        @Override
        public boolean isApplicableToContext(Class<? extends SCMSourceContext> contextClass) {
        public boolean isApplicableToContext(@NonNull Class<? extends SCMSourceContext> contextClass) {
            return GitHubSCMSourceRequest.class.isAssignableFrom(contextClass);
        }

src/main/java/org/jenkinsci/plugins/github_branch_source/ForkPullRequestDiscoveryTrait.java

@@ -86,7 +86,7 @@ public String getDisplayName() {
        }

        @Override
        public boolean isApplicableToContext(Class<? extends SCMSourceContext> contextClass) {
        public boolean isApplicableToContext(@NonNull Class<? extends SCMSourceContext> contextClass) {
            return GitHubSCMSourceRequest.class.isAssignableFrom(contextClass);
        }

src/main/java/org/jenkinsci/plugins/github_branch_source/OriginPullRequestDiscoveryTrait.java

@@ -75,7 +75,7 @@ public String getDisplayName() {
        }

        @Override
        public boolean isApplicableToContext(Class<? extends SCMSourceContext> contextClass) {
        public boolean isApplicableToContext(@NonNull Class<? extends SCMSourceContext> contextClass) {
            return GitHubSCMSourceRequest.class.isAssignableFrom(contextClass);
        }

src/main/java/org/jenkinsci/plugins/github_branch_source/SSHCheckoutTrait.java

@@ -5,6 +5,7 @@
import com.cloudbees.plugins.credentials.common.StandardListBoxModel;
import com.cloudbees.plugins.credentials.common.StandardUsernameCredentials;
import edu.umd.cs.findbugs.annotations.CheckForNull;
import edu.umd.cs.findbugs.annotations.NonNull;
import hudson.Extension;
import hudson.model.Item;
import hudson.model.Queue;
@@ -53,12 +54,12 @@ public String getDisplayName() {
        }

        @Override
        public boolean isApplicableToContext(Class<? extends SCMSourceContext> contextClass) {
        public boolean isApplicableToContext(@NonNull Class<? extends SCMSourceContext> contextClass) {
            return GitHubSCMSourceRequest.class.isAssignableFrom(contextClass);
        }

        @Override
        public boolean isApplicableToSCM(SCMDescriptor<?> scm) {
        public boolean isApplicableToSCM(@NonNull SCMDescriptor<?> scm) {
            return scm instanceof GitSCM.DescriptorImpl;
        }