gen_stub: fix typo $minPHPCompatability to $minPHPCompatibility

Author: DanielEScherzer

build/gen_stub.php

@@ -2226,11 +2226,11 @@ public function findEquivalent(array $generatedFuncInfos): ?FuncInfo {
         return null;
     }
 
-    public function toArgInfoCode(?int $minPHPCompatability): string {
+    public function toArgInfoCode(?int $minPHPCompatibility): string {
         $code = $this->return->beginArgInfo(
             $this->getArgInfoName(),
             $this->numRequiredArgs,
-            $minPHPCompatability === null || $minPHPCompatability >= PHP_81_VERSION_ID
+            $minPHPCompatibility === null || $minPHPCompatibility >= PHP_81_VERSION_ID
         );
 
         foreach ($this->args as $argInfo) {