Merge branch 'PHP-8.1'

* PHP-8.1:
  Change gen-stub.php to gen_stub.php in help text

Author: kocsismate

build/gen_stub.php

@@ -3284,7 +3284,7 @@ function initPhpParser() {
 }
 
 if (isset($options["h"]) || isset($options["help"])) {
-    die("\nusage: gen-stub.php [ -f | --force-regeneration ] [ --generate-classsynopses ] [ --replace-classsynopses ] [ --generate-methodsynopses ] [ --replace-methodsynopses ] [ --parameter-stats ] [ --verify ] [ -h | --help ] [ name.stub.php | directory ] [ directory ]\n\n");
+    die("\nusage: gen_stub.php [ -f | --force-regeneration ] [ --generate-classsynopses ] [ --replace-classsynopses ] [ --generate-methodsynopses ] [ --replace-methodsynopses ] [ --parameter-stats ] [ --verify ] [ -h | --help ] [ name.stub.php | directory ] [ directory ]\n\n");
 }
 
 $fileInfos = [];