JENKINS-65287 - add an online help for polling and changelog checkboxes

Author: Onyimatics

src/main/resources/org/jenkinsci/plugins/workflow/steps/scm/SCMStep/help-changelog.html

@@ -0,0 +1,11 @@
+<div>
+        Enable or Disable 'Include in changelog':
+        <p>
+                If 'Include in changelog' is enabled or 'Include in polling' is enabled, then when polling occurs, the
+                job will be started if changes are detected from this SCM source.
+        </p>
+        <p>
+                If 'Include in changelog' is disabled and 'Include in polling' is disabled, then when polling occurs,
+                changes that are detected from this repository will be ignored.
+        </p>
+</div>

src/main/resources/org/jenkinsci/plugins/workflow/steps/scm/SCMStep/help-poll.html

@@ -0,0 +1,11 @@
+<div>
+    Enable or Disable 'Include in polling'
+    <p>
+        If 'Include in polling' is enabled or 'Include in changelog' is enabled, then when polling occurs, the job will
+        be started if changes are detected from this SCM source.
+    </p>
+    <p>
+        If 'Include in polling' is disabled and 'Include in changelog' is disabled, then when polling occurs, changes
+        that are detected from this repository will be ignored.
+    </p>
+</div>