[Config] Restore default values for RectorConfig->parallel() config s…

…imilar to original <=0.18.x version (#5472)

* [Config] Restore default values for RectorConfig->parallel() config similar to original <=0.18.x version

* remove comment

* regenerate docs

* [ci-review] Rector Rectify

* update jobsize to 16

---------

Co-authored-by: GitHub Action <actions@github.com>

src/Config/RectorConfig.php

@@ -97,11 +97,7 @@ public function disableParallel(): void
         SimpleParameterProvider::setParameter(Option::PARALLEL, false);
     }
 
-    /**
-     * Defaults in sync with https://phpstan.org/config-reference#parallel-processing
-     * as we run PHPStan as well
-     */
-    public function parallel(int $processTimeout = 120, int $maxNumberOfProcess = 32, int $jobSize = 20): void
+    public function parallel(int $processTimeout = 120, int $maxNumberOfProcess = 16, int $jobSize = 16): void
     {
         SimpleParameterProvider::setParameter(Option::PARALLEL, true);
         SimpleParameterProvider::setParameter(Option::PARALLEL_JOB_TIMEOUT_IN_SECONDS, $processTimeout);