Consistently use issues.jenkins.io for issue links (#5724)

core/src/main/java/hudson/Util.java

@@ -241,9 +241,9 @@ public class Util {
     @NonNull
     public static String loadFile(@NonNull File logfile, @NonNull Charset charset) throws IOException {
         // Note: Until charset handling is resolved (e.g. by implementing
-        // https://issues.jenkins-ci.org/browse/JENKINS-48923 ), this method
+        // https://issues.jenkins.io/browse/JENKINS-48923 ), this method
         // must be able to handle character encoding errors. As reported at
-        // https://issues.jenkins-ci.org/browse/JENKINS-49112 Run.getLog() calls
+        // https://issues.jenkins.io/browse/JENKINS-49112 Run.getLog() calls
         // loadFile() to fully read the generated log file. This file might
         // contain unmappable and/or malformed byte sequences. We need to make
         // sure that in such cases, no CharacterCodingException is thrown.
@@ -253,7 +253,7 @@ public class Util {
         // from a Charset and the reader returned by Files.newBufferedReader()
         // handle malformed and unmappable byte sequences for the specified
         // encoding; the latter is more picky and will throw an exception.
-        // See: https://issues.jenkins-ci.org/browse/JENKINS-49060?focusedCommentId=325989&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-325989
+        // See: https://issues.jenkins.io/browse/JENKINS-49060?focusedCommentId=325989&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-325989
         try {
             return FileUtils.readFileToString(logfile, charset);
         } catch (FileNotFoundException e) {
@@ -418,7 +418,7 @@ public class Util {
         // by default, the permissions of the created directory are 0700&(~umask)
         // whereas the old approach created a temporary directory with permissions
         // 0777&(~umask).
-        // To avoid permissions problems like https://issues.jenkins-ci.org/browse/JENKINS-48407
+        // To avoid permissions problems like https://issues.jenkins.io/browse/JENKINS-48407
         // we can pass POSIX file permissions as an attribute (see, for example,
         // https://github.com/jenkinsci/jenkins/pull/3161 )
         final Path tempPath;