PHPDoc: Replace non-existing return type tuple with array

Summary: `tuple` is not a valid type. See https://docs.phpdoc.org/guide/references/phpdoc/types.html and https://docs.phpdoc.org/guide/references/phpdoc/tags/return.html.

Test Plan: Read docs; run static code analysis.

Reviewers: O1 Blessed Committers, valerio.bozzolan

Reviewed By: O1 Blessed Committers, valerio.bozzolan

Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Differential Revision: https://we.phorge.it/D26066

src/applications/differential/parser/DifferentialChangesetParser.php

@@ -1301,7 +1301,7 @@ final class DifferentialChangesetParser extends Phobject {
    *
    * @param string $spec Range specification, indicating the range of the diff
    *               that should be rendered.
-   * @return tuple List of <start, end, mask> suitable for passing to
+   * @return array Tuple of <start, end, mask> suitable for passing to
    *               @{method:render}.
    */
   public static function parseRangeSpecification($spec) {

src/infrastructure/daemon/workers/PhabricatorWorker.php

@@ -248,7 +248,7 @@ abstract class PhabricatorWorker extends Phobject {
   /**
    * Get tasks queued as followups by @{method:queueTask}.
    *
-   * @return list<tuple<string, wild, int|null>> Queued task specifications.
+   * @return list<array<string, wild, int|null>> Queued task specifications.
    */
   final protected function getQueuedTasks() {
     return $this->queuedTasks;