Fix truncated code example in database-basics.md

The toPHP() method in the PointMutationType example was missing
the closing parenthesis, semicolon, and closing brace.

Author: dereuromark

docs/en/orm/database-basics.md

@@ -703,7 +703,8 @@ class PointMutationType extends BaseType
             return null;
         }
 
-        return $this->pmDecode($valu
+        return $this->pmDecode($value);
+    }
 
     public function marshal(mixed $value): mixed
     {