Update popover URL to point to help page of same domain

ee/app/assets/javascripts/epics/sidebar/components/sidebar_date_picker.vue

@@ -121,7 +121,11 @@ export default {
       return this.getPopoverConfig({
         title: s__('Epics|These dates affect how your epics appear in the roadmap. Dates from milestones come from the milestones assigned to issues in the epic. You can also set fixed dates or remove them entirely.'),
         content: `
-          <a href="https://docs.gitlab.com/ee/user/group/epics/#Dates">${s__('Epics|More information')}</a>
+          <a
+            href="${gon.gitlab_url}/help/user/group/epics/index.md#planned-start-date-and-planned-finish-date"
+            target="_blank"
+            rel="noopener noreferrer"
+          >${s__('Epics|More information')}</a>
         `,
       });
     },
@@ -129,7 +133,11 @@ export default {
       return this.getPopoverConfig({
         title: this.dateInvalidTooltip,
         content: `
-          <a href="https://docs.gitlab.com/ee/user/group/epics/#Dates">${s__('Epics|How can I solve this?')}</a>
+          <a
+            href="${gon.gitlab_url}/help/user/group/epics/index.md#planned-start-date-and-planned-finish-date"
+            target="_blank"
+            rel="noopener noreferrer"
+          >${s__('Epics|How can I solve this?')}</a>
         `,
       });
     },

ee/spec/javascripts/epics/sidebar/components/sidebar_date_picker_spec.js

@@ -11,6 +11,7 @@ const createComponent = (datePickerProps = mockDatePickerProps) => {
 };
 
 describe('SidebarParticipants', () => {
+  window.gon = { gitlab_url: gl.TEST_HOST };
   let vm;
 
   beforeEach(() => {
@@ -102,7 +103,9 @@ describe('SidebarParticipants', () => {
       });
 
       it('returns popover config object containing `content` with href pointing to correct documentation', () => {
-        expect(vm.popoverOptions.content.trim()).toBe('<a href="https://docs.gitlab.com/ee/user/group/epics/#Dates">More information</a>');
+        const hrefContent = vm.popoverOptions.content.trim();
+        expect(hrefContent).toContain(`${gon.gitlab_url}/help/user/group/epics/index.md#planned-start-date-and-planned-finish-date`);
+        expect(hrefContent).toContain('More information');
       });
     });
 
@@ -112,7 +115,9 @@ describe('SidebarParticipants', () => {
       });
 
       it('returns popover config object containing `content` with href pointing to correct documentation', () => {
-        expect(vm.dateInvalidPopoverOptions.content.trim()).toBe('<a href="https://docs.gitlab.com/ee/user/group/epics/#Dates">How can I solve this?</a>');
+        const hrefContent = vm.dateInvalidPopoverOptions.content.trim();
+        expect(hrefContent).toContain(`${gon.gitlab_url}/help/user/group/epics/index.md#planned-start-date-and-planned-finish-date`);
+        expect(hrefContent).toContain('How can I solve this?');
       });
     });
   });