fix(dashboard): better Ignored description

lib/workers/repository/__fixtures__/master-issue_with_2_PR_closed_ignored.txt

 This issue contains a list of Renovate updates and their statuses.
 
-## Closed/Ignored
+## Ignored or Blocked
 
-These updates were closed unmerged and will not be recreated unless you click a checkbox below.
+These are blocked by an existing closed PR and will not be recreated unless you click a checkbox below.
 
  - [ ] <!-- recreate-branch=branchName1 -->pr1
  - [ ] <!-- recreate-branch=branchName2 -->pr2 (`dep2`, `dep3`)

lib/workers/repository/dependency-dashboard.ts

@@ -209,9 +209,9 @@ export async function ensureMasterIssue(
     (branch) => branch.res === ProcessBranchResult.AlreadyExisted
   );
   if (alreadyExisted.length) {
-    issueBody += '## Closed/Ignored\n\n';
+    issueBody += '## Ignored or Blocked\n\n';
     issueBody +=
-      'These updates were closed unmerged and will not be recreated unless you click a checkbox below.\n\n';
+      'These are blocked by an existing closed PR and will not be recreated unless you click a checkbox below.\n\n';
     for (const branch of alreadyExisted) {
       const pr = await platform.findPr({
         branchName: branch.branchName,