Fix a typo in UPGRADING.INTERNALS

Author: TysonAndre

UPGRADING.INTERNALS

@@ -34,7 +34,7 @@ PHP 7.4 INTERNALS UPGRADE NOTES
  c. Function/property/class flags changes
     - ZEND_ACC_CTOR and ZEND_ACC_DTOR are removed. It's possible to check if
       method is a constructor/destructor using the following condition
-      (func->commpon.scope->constructor == func).
+      (func->common.scope->constructor == func).
     - ZEND_ACC_IMPLEMENTED_ABSTRACT is removed (it was used only internally
       during inheritance).
     - ZEND_ACC_IMPLICIT_PUBLIC is removed (it was used only for reflection)