phpGH-15976: don't say "type alias" (php#15996)

Follow-up to phpGH-15977

Author: DanielEScherzer

Zend/tests/gh15976/alias-names.phpt

@@ -8,6 +8,6 @@ class_alias( 'stdClass', 'bool' );
 
 ?>
 --EXPECTF--
-Deprecated: Using "_" as a type alias is deprecated since 8.4 in %salias-names.php on line 3
+Deprecated: Using "_" as a class alias is deprecated since 8.4 in %salias-names.php on line 3
 
-Fatal error: Cannot use "bool" as a type alias as it is reserved in %salias-names.php on line 4
+Fatal error: Cannot use "bool" as a class alias as it is reserved in %salias-names.php on line 4

Zend/tests/type_declarations/scalar_reserved2_class_alias.phpt

@@ -7,4 +7,4 @@ class foobar {}
 class_alias("foobar", "int");
 ?>
 --EXPECTF--
-Fatal error: Cannot use "int" as a type alias as it is reserved in %s on line %d
+Fatal error: Cannot use "int" as a class alias as it is reserved in %s on line %d

Zend/tests/type_declarations/scalar_reserved3_class_alias.phpt

@@ -7,4 +7,4 @@ class foobar {}
 class_alias("foobar", "float");
 ?>
 --EXPECTF--
-Fatal error: Cannot use "float" as a type alias as it is reserved in %s on line %d
+Fatal error: Cannot use "float" as a class alias as it is reserved in %s on line %d

Zend/tests/type_declarations/scalar_reserved4_class_alias.phpt

@@ -7,4 +7,4 @@ class foobar {}
 class_alias("foobar", "string");
 ?>
 --EXPECTF--
-Fatal error: Cannot use "string" as a type alias as it is reserved in %s on line %d
+Fatal error: Cannot use "string" as a class alias as it is reserved in %s on line %d

Zend/tests/type_declarations/scalar_reserved6_class_alias.phpt

@@ -7,4 +7,4 @@ class foobar {}
 class_alias("foobar", "bool");
 ?>
 --EXPECTF--
-Fatal error: Cannot use "bool" as a type alias as it is reserved in %s on line %d
+Fatal error: Cannot use "bool" as a class alias as it is reserved in %s on line %d

Zend/zend_API.c

@@ -3571,7 +3571,7 @@ ZEND_API zend_result zend_register_class_alias_ex(const char *name, size_t name_
 		zend_str_tolower_copy(ZSTR_VAL(lcname), name, name_len);
 	}
 
-	zend_assert_valid_class_name(lcname, "a type alias");
+	zend_assert_valid_class_name(lcname, "a class alias");
 
 	lcname = zend_new_interned_string(lcname);