s/$sqlite3/$destination

Co-authored-by: Nikita Popov <nikita.ppv@googlemail.com>

Author: kamil-tekiela

ext/sqlite3/sqlite3.stub.php

@@ -41,7 +41,7 @@ public function loadExtension(string $name) {}
 
 #if SQLITE_VERSION_NUMBER >= 3006011
     /** @return bool */
-    public function backup(SQLite3 $sqlite3, string $sourceDatabase = "main", string $destinationDatabase = "main") {}
+    public function backup(SQLite3 $destination, string $sourceDatabase = "main", string $destinationDatabase = "main") {}
 #endif
 
     /** @return string */