Issue #3271490: Fix redirected links to documentation

fillpdf.module

@@ -15,7 +15,7 @@ function fillpdf_help($route_name, RouteMatchInterface $route_match) {
   switch ($route_name) {
     case 'help.page.fillpdf':
       $content = t('See the <a href=":documentation">documentation on drupal.org</a> for a full description of and guide to this module.', [
-        ':documentation' => Url::fromUri('https://www.drupal.org/docs/8/modules/fillpdf')
+        ':documentation' => Url::fromUri('https://www.drupal.org/docs/contributed-modules/fillpdf')
           ->toString(),
       ]);
       return $content;
@@ -24,7 +24,7 @@ function fillpdf_help($route_name, RouteMatchInterface $route_match) {
       if (\Drupal::moduleHandler()->moduleExists('help')) {
         return t('See the <a href=":link">documentation</a> for an explanation on dowloading these forms to PDF',
           [
-            ':link' => Url::fromUri('https://www.drupal.org/docs/8/modules/fillpdf')
+            ':link' => Url::fromUri('https://www.drupal.org/docs/contributed-modules/fillpdf')
               ->toString(),
           ]);
       }

src/Plugin/PdfBackend/PdftkPdfBackend.php

@@ -23,7 +23,7 @@ use Drupal\Core\File\FileSystemInterface;
  *     "Locally installed pdftk. You will need a VPS or a dedicated server to
  *     install pdftk, see <a href=':url'>documentation</a>.",
  *     arguments = {
- *       ":url" = "https://www.drupal.org/docs/8/modules/fillpdf"
+ *       ":url" = "https://www.drupal.org/docs/contributed-modules/fillpdf"
  *     }
  *   ),
  *   weight = -5